I don't understand why, but I've been using AppYet for several years and it's never given me any problems. Now, by updating it, Google Play detects that policies have been violated.
Publishing status: Rejected
After review, your app has been rejected and wasn't published due to a policy violation. If you submitted an update, the previous version of your app is still available on Google Play.
Issue: Violation of Device and Network Abuse policy
We don’t allow apps that interfere with, disrupt, damage, or access in an unauthorized manner the user’s device, other devices or computers, servers, networks, application programming interfaces (APIs), or services, including but not limited to other apps on the device, any Google service, or an authorized carrier’s network.
Your app shouldn’t access or use the service or API in a manner that violates its terms of service. For example, your app shouldn't download, monetize, or access YouTube videos in a way that violates the YouTube Terms of Service.