Thinking about Starcraft Dominion, it will likely be released on PS and Xbox too to get to the largest market. I’m wondering if Sony can/will force them to release on PS6 only and not the PS5? PS6 will probably be expensive (ramageddon) and not sell well, and Blizzard will simply want the largest audience. In the past you kinda needed one console generation or the other* but given the whole situation of both gaming and hardware costs, I see uhh console generations and game settings all blending together to put it that way. (*I’m aware many games released on two generations or downscaled for nintendo. It’s often said but I think we’re at a turning point of what we need. How big is the market for 4k? etc.)
They definitely could if they wanted to, on everything newer than the ps2 i think. They control the digital stores so of course they can easily block certain models. Physical games are digitally signed. Sony or microsoft could invalidate your signing key, even for games you have already released, making every disc unplayable on an unmodded console. Idk if they ever actually do that though.