RDR2 has an online component just like GTA online. In this online mode you play your character as long as you like, building up assets and stats as you complete

RDR2 has an online component just like GTA online. In this online mode you play your character as long as you like, building up assets and stats as you complete missions/raids/races etc. This game mode is open ended, so if you spend enough time you can build up an enormous amount of in game assets and currency. Rockstar locks multiplayer to specific platforms, so if you buy a game on xbox and level up your character there, you can never use that same character on any other platform. In this way you are correct, if he had played on PC all this time then his game save would be in the PC platform cloud not the Stadia cloud. The guy is a youtube/twitch streamer, so to him loosing this character probably feels like loosing his job.