While pc can play old games, you can sometimes run into compatibility issues. Especially games in the ps1/2/3 era.

Og Xbox and xbox 360 games work without much issues on Xbox one and series XS. Ps4 and Xbox one games are 99% playable on Series XS and Ps5.

That's the (unknown) future. But currently they are not cracked. Hence you can't pirate them.