Yeah, but probably not on GP, due to the copyright... so there will be people doing cash grab asset swaps with ad for every time you move a meter, and obviously malware creators on the internet

Yes, they can, but it doesn't mean they should, unless you wanna buy a new phone every few months, I'd know because I used to play Genshin on my phone.

re3/revc are clean room reverse engineered projects, while gtav source we have is leaked proprietary code