People are abusing language in a way that words become meaningless
Such as "liberal" (formerly meaning: let's get government out of people's lives) now meaning "government must regulate every aspect of everybody's life at every second"
It's like "stealing a meme"
The "Right mouse button, Save as..." NFT critics were so close to rehabilitating the words "copy" and "steal", but no, they squandered it
I don't even think your issue is with the language. You know the meaning being conveyed, I think. If I sit and program a game all day for two years straight I'm going to feel it's my property. It legally is. Crafting a joke may not take as much, but some ownership is felt. "stealing" can't be meaningfully policed, but if someone really goes overboard like carlos mencia, there is a reckoning after.
Game piracy can't be meaningfully policed either. Because antipiracy is also anticonsumer in 99% of cases.
I don't buy books, I download them. Some of these books no longer have copyright. Some of them were written last year. The writers are off no different if I don't download them if I wouldn't have bought them anyways. But that is a hypothetical that exists purely in my mind. There are games that I thought I would never buy, but then suddenly I have the urge to buy it at some point and I do.
If people never did in the future what they now decide to do, the world would be full of slim and fit people. Many people decide to. Only a few keep it up.
The hypothetical of "I would never buy it" is a fiction, an uncertainty. Wanting to play, or even just try the game, is a desire that the author (or studio or..) monetizes. Many games are only made with this purpose. And by copying it, you are stealing access to something someone else invested into existing in the first place.
I justify all sorts of piracy, as I justify all sorts of stealing. It is stealing, though. I think everybody knows that it's a kind of stealing, even if it's distinct from stealing a loaf of bread.