Even games without DRM suffer massive piracy rates if they’re any good. The Witcher 2 is a good example. The CEO of CDPR estimated that by the time they had sold 1M copies, at least 4.5M illegal copies had been downloaded. He believed that was optimistic estimate, and that the actual number was much higher.
It’s part of the reason so many companies are trying F2P models, which I personally don’t care for. Most F2P games are massive grinds. There’s some exceptions to that, but there’s enough that I’d just rather plunk down my $50 and be done with it.
You can try and sue a company for anything, doesn’t mean anything. I don’t think that you’d win, not in the US at least, multiple US district courts uphold EULAs all the time. Even the ones where you have to buy the product just to see it. You need to prove standing, can’t see you having it. Even if you did, I don’t see how you’re going to prove that you’re entitled to some form of relief. Their EULA is almost certainly going to be upheld and they never implied that they would provide online services for eternity.