In India a lot of payment happens through UPI. UPI apps can be used without Google but all apps use “Play Integrity API”. The tests can only be passed by Google approved software and hardware, especially on recent versions of android - which Google forces on you in the name of security.
Also all banking apps use Play Integrity API. Not just UPI based payment apps.
Google WEI is a step in similar direction for web.
Most addictive would be DoTA. You can probably find 10 million player with atleast 5k hours