This is doubly true for games, which tend to be re-released over and over again on different platforms. This is true to a lesser extent for things like movies, but it’s much worse with gaming where each console is a closed ecosystem that’s incompatible with other systems. At least with Blu-Ray, you can expect any Blu-Ray player to play the movie you’ve purchased. It’s not like a Toshiba player will only play Toshiba brand Blu-Ray discs.
Companies love to use the “you don’t own the game, you own a personal license to use the game” line when revoking rights to play games you’ve legally purchased… But that goes both ways; If you own a personal license to use the game, it shouldn’t matter what platform it’s on, because it’s the same game regardless of whether you’re playing on PlayStation or PC.