Well if GOG becomes evil, I’ll have all my games stored locally and I can do what I want with them.

While it’s true there is no GOG Galaxy for Linux, I think they sponsor Heroic and it works quite well on Steam Deck to be honest.

I might get pirated games if my Steam Library gets taken away since, contrary to PS5 or GOG, I wouldn’t be able to do anything with my games.

In the end, if I get a Steam Machine, it’ll probably be:

1. GOG when available
2. Steam
3. Playstation for their exclusives

Without the Steam Machine, it’ll be the same but I’ll have to take into account that some games are too demanding for the Deck, so it’ll be PS5 physical.