The gaming data is all stored server side and subject to the tightest controls imaginable. You would never be able to twiddle bits and get an advantage in the game. Your PI however is sold to all and sundry, as well as being made available in an S3 bucket with no permissions for anyone who doesn’t want to pay for it.

What PI do mobile games even collect? Is it just payment history?

I'm sure it includes as much location data as it can divine, time of day you play, hours you play, anything it can get from too many permissions, etc.