So Google should have never allowed competition to begin with like Apple. That doesn't seem like a great answer to me.

They did not allow competition, they made illegal deals to keep their App Store installed on other devices.

If they left it alone and all OEMs chose to keep Google play store and billing, nothing would’ve happened.

No, Google shouldn’t have given Riot Games $10m in marketing to prevent launching a competing android store, or give OEMs 20% cut of Play revenue to prevent them from bundling competing stores. Or cut a special deal with Spotify where it pays 0% while still using Play Store billing.

Right - a co-marketing deal isn’t the illegal thing. It’s the "limiting competition" part that gets them in trouble. This case was entirely about figuring out when a ‘good business deal’ becomes anti-competitive. This is also playing out now with Google paying Apple for default search engine.

If it was revealed that Sony gave Epic a special marketing deal to prevent Epic from launching a console, then yeah that would be pretty dodgy!

Epic shouldn't get special pricing either. Even Epic will say that.