> It can be a mess of a system that relies on all kinds of services

Nowadays, this is much less of a "can" and more of a "definitely is" :(

Based on what I see as (non-game) security consultant in terms of service complexity, what modern FOSS projects consider a normal container constellation, and on what I see from at least one indie dev whom I personally know. It has been a topic I've brought up since he put so many hours into it and the game is fun and the binary didn't even run if you don't have a compatible Google Play Services version, much less the various back-ends that it connects to for accounts, level data, level thumbnails, matchmaking, etc. until you even get to the real-time multiplayer server