I think the usual theory is: So many of us got into computers because we loved playing video games, and wanted to make them, and then loved making games. So the game companies that will pay you money to make games (even if there's a lot of non-fun to it) don't have to pay as much as, say, a surveillance capitalism company of sharp-elbowed careerists.

IIUC, the majority of FAANG is people who are there, first and foremost, for the paycheck. (And then maybe they get interested in the work, especially if it seems like progress towards a promotion for more money, or because it gave them skills or resume keywords that they can then use to get more money elsewhere. It's the money/career that's interesting first -- craft and product are only a consequence of wanting the money.)