Tracking by Clozemaster Android app

I am disappointed to find that the Clozemaster Android app tries to send roughly one hundred tracking messages every week to Amplitude and Google Firebase Analytics. I know this because my phone runs a ‘de-googled’ Android fork called Murena, and the operating system keeps a record of how many trackers each app wants to send and where it wants to send them. And usefully, it blocks all of them.

Why does Clozemaster spy on me? I am a paying customer, I don’t get anything for free. I don’t see how you can justify this behaviour.