Imho Ubisoft has long redeemed themselves.
Can’t share your resentment about Darksiders 3.. Other than it somehow looks uninspired and is not developed by the same team.
In general I’d differentiate more on a game by game basis. If it contains intrusive MTXs, don’t buy, but I see no reason to not buy Sekiro, just because it’s published by Activision.
The old team does not exist anymore and the new team is composed of a lot of the old developers and even the creator of Vigil to begin with.
Look the new trailers it looks like a real darksiders 3 :)