They should either be required to refund those purchases or they shouldn’t be allowed to remove them.
No disagreement there, but we live in a world where they absolutely can and will do this stuff and get away with it with no consequences. Until either of those two options you propose are reached, I see no moral issue with pirating a game content you paid for and can no longer play.
I’m not talking about the morality of a person who was already pirating it before, or pirate games videos not affected by this issue. Just a case where a person bought a game content from Sony, who then removed their purchase without compensation due to reasons beyond the terms and conditions the customer expected.