I got this info:

Dear Flurry User:
This is your final notice that one or more of your apps currently uses Flurry’s Restricted Feature Set (RFS). Beginning August 16, 2019, Flurry will discontinue supporting RFS due to updates by Apple to its App Store Guidelines 1.3 and 5.1.4. These state that apps "intended for kids cannot include third-party advertising or analytics software and may not transmit data to third parties."
RFS collection of data, as well as access to those apps on Flurry dashboards, ends on August 15, 2019. All historical data for RFS apps will be permanently removed from Flurry servers by August 31, 2019.
If you would like to continue using Flurry, please review the main Flurry Terms of Service with your legal counsel to determine whether or not they are acceptable for your app. If after a legal review you feel the Flurry Terms of Service are acceptable for your app, you can remove RFS by clicking the pencil icon on the Admin > Application page.
If you cannot accept Flurry’s Terms of Service, please download your data by August 31, 2019 using the Raw Data API. Please note you can only download 30 days’ worth of data at a time.
Detailed steps for removing RFS or downloading data can be found here.
If you believe you have received this notice in error because your mobile application does not use RFS, please contact us at support@flurry.combefore August 16, 2019.
Sincerely,

Team Flurry

I am using Flurry in a lot of apps for kids and now wonder if this action from Flurrys side is causing any trouble with existing apps in the store?

Thanks for your help!

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I

Well, if you read the message that you posted, then there's your answer:
 

App Store Guidelines 1.3 and 5.1.4. These state that apps "intended for kids cannot include third-party advertising or analytics software and may not transmit data to third parties."

If you have apps that are intended for kids and you do not remove Flurry (and any other possible analytics plugins/systems) from those apps, then they will eventually be flagged by Apple and removed from the App Store.

As @spyric said it isn't a flurry problem. Kids apps going forward are not allowed to have any analytics or ads according to Apple. So that means no Flurry, no GameAnalytics, no Firebase, no Google Analytics and no whatever other company you can think of.

I think the question is "Is the Corona app still working when Flurry stops the service for apps using Flurry?"

Well, the question was "if this action from Flurrys side is causing any trouble with existing apps in the store?" and the answer is that Apple will remove the apps as soon as they enforce their rule. So yes, it will cause trouble.

The apps communications with Flurry's servers most likely won't go through after that, but that's pretty much the same that would happen if the app doesn't have Internet connection or the servers are down for some reason, etc. The apps won't likely crash, but they'll be removed.

I don't think Apple will remove "Intended for kids" apps using Flurry . How should they notice it that these apps use Flurry except you submit an update ?! 

@festival, Apple can easily monitor what the apps on their devices do. They also know who those analytics providers are, e.g. Flurry, Google Analytics, Game Analytics, etc. When your apps contain code referring to these services and when they actively try to contact their servers, Apple has two clear ways of seeing that your app uses third-party analytics.

Also, you don't need to guess here, and when it comes to Apple, you should never guess. Just read the App Store Review Guidelines: https://developer.apple.com/app-store/review/guidelines/

Here are a few snippets:

1.3. and 5.1.4. Apps in the Kids Category may not include third-party advertising or analytics.

From introduction,

 

 

Apple is quite clear in their wording. Apps intended for kids may not include third-party advertising or analytics. They also state that your app may not have any outbound links. You are responsible for complying with the rules and if you try to cheat it, your app will be removed and at worst you will also be expelled.

 

Well "Apps intended for kids" isn't clear at all.  

In the past with the 32bit/64bit problem Apple contacted you to update and listed the apps which you should update. 

Yes it is!

When you are adding a new app to your iTunes Connect account, there is a clearly labelled "Is this app designed for kids?" option that is off by default. The developer must explicitly opt-in to make their app designed for kids. It can't get much clearer that that!

Yes it is!

When you are adding a new app to your iTunes Connect account, there is a clearly labelled "Is this app designed for kids?" option that is off by default. The developer must explicitly opt-in to make their app designed for kids. It can't get much clearer that that!

. Thanks. Didn't know that they added this flag for new apps. If I click on new app I don't see this flag. Is it in age rating?

(Edit: There is no new flag . He meant the flag in age rating where you put your app in the kids category.)

But what with the millions of games which are old and don't update?

I'm not sure when "kids apps" was originally introduced, but they've been around for ages. If an app predates this or wasn't explicitly put in the kids category by the developer, then of course they won't be affected by this because they aren't "kids apps". As for what happens to "kids apps" that won't update? Well, we've covered that already.