PS5 Jailbreak lets you play PS2 games from the disc. (Kinda)

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JackHandy said:

Sony learned quickly that there is no punishment for locking you out of BC for the sake of selling remasters and subscriptions. If customers tolerate something, business will do it. It's really that simple.

This, basically. Companies want to make everything into a subscription rather than a one-time payment so they can just continually take your money forever.