GOG added a new login option
I second the comment about hoping that it isn't not a Faustian deal in the thread I found about it.
Also Iirc, besides Xbox, Discord and Google were already options for a while, and Facebook is no longer there as a login option it seems.
I guess they noticed that pretty much nobody uses FB any more. It's mostly just bots and dead people who have that account.
That's a bad omen.