For everyone having opinions about how many hours this person has spent playing RDR2, you should probably note that he's an RDR2 Youtube and Twitch content creator/streamer. So at face value, it has been his job for the last 2.5 years.
(Sorry, I couldn't resist.)
But have never made anything, just played with the menus they put there for you.
Setting up your own hardware streaming build in 2019 was more difficult and expensive.
So this user "bought" (or accepted) a product from Google that promised to make everything easy for them and, until now, it was fulfilling that promise.