I dislike Steam and typically only play a game there I picked up at a discount from Humble Bundle or Indiegala. Everything else is on GOG (OK, I do have free games from Epic). My entire Divinity collection is on GOG. What I like about GOG is that I can play the game anywhere and don't have to worry about an internet connection. With GOG, the game will synch up later if I've lost the internet connection. I also like DRM free stuff; it's a major PIA to wait for Steam to confirm everything (especially if it's been a month or more since I played anything there).

I really do hope Larian gives GOG users EA, but if they don't, here's my question:

Can I buy BG3 during EA on Steam and then get my key (when the game launches 1.0) for GOG?

I'm thinking the answer will be 'no' as they'd then have to send Steam keys at launch to everyone who's in EA on Steam and who wants to remain there. One of the beauties of EA is that the game can be updated on the user's account at the time of retail release.

Unfortunately, I think many who prefer GOG will wind up waiting until retail release. As a result, Larian will miss many data points. I know Larian did use GOG for EA of DOS:2, but they may have had problems, which would explain why they are only offering Steam. I'm not even thinking about Stadia as that belongs to Google, and Google tends to mess up whatever they run. They've recently messed up YouTube where you don't get notifications anymore on the gmail account.