I was meaning more the fact that Bethesda released on playstation until Microsoft bought them.

Sony has been playing this game for a longer time, as @CoderKat said, and nobody cared

Do you know Psygnosis of WipEout fame? They developed multiplatform titles for Staturn, PC and N64, when Sony aquired them that stopped (Well, they launched WipEout on the N64 and that angered Sony but they stopped after that)

Sucker Punch (Ghost of Tsushima) first game was for the N64

Guerrilla Games (Horizon Forbidden West) started developing on the Game Boy Color, and also made games for the GBA and Xbox

And a very long list of developers now owned by Sony, most of them developed for a bunch of different platforms before Sony's acquisition

But the thing is most people think those studios were created by Sony rather than purchased