Bethesda, Bioware, and Konami.
Bethesda lost all trust with Fallout 76. Most developers are allowed one bad game before consumers write them off so completely, but between how the studio overhyped and just how terrible it was, then their 'fixes' making it even worse, their fall from grace was as sudden as it was unexpected,
Bioware's troubles stem mostly from mismanagement by EA. It started with the controversies surrounding Dragon AGe 2 and Mass Effect 3, both of which are fine games in their own rights but the dumbing down of Dragon Age 2 and the terrible ending for Mass Effect 3 really hurt the company. Then Andromeda was a rushed buggy mess with a bad story and Anthem was plain bad.
Konami. If there's a company in the industry worse than EA, it's Konami. It may be that Kojima needed to be reined in, but there is no excuse for how they treated him, the way they seem to treat employees in general, the disregard they have shown for their franchises, ect. If they want to be a Pachinko company then just do that and stop pretending to be a video game developer.