Pretty sure all of those games are still available if not purchasable on several storefronts, including Steam. They are no longer available/searchable on Steam, because remastered versions were released. Meaning that people that previously purchased them can still access the games as a download, but new consumers are directed towards to remastered editions rather than the more than decade old editions.
I know it's the case for Ghostbusters (I own the original version, still downloadable), EA's press release confirmed Bad Company 2 would remain available as a digital download for offline play, quick google search shows people are still downloading and playing the original Prey on their Steam Decks despite no store page existing.
In other words the exact same situation you'd be in if you bought them physically or if you bought them digitally except the digital purchaser doesn't have to worry about damaging their disc, or their disc degrading due to disk rot.
The follow up question to your statement is when was the last time you played, and beat, any of those games? For the majority of people the answer is "not since I bought it."
I also didn't say it never happens, but rather the likelihood of your disc failing is roughly as likely as a distributor of the games taking access away from you, especially in the modern era where Xbox, Playstation and Steam are seemingly going to stick to a consistent architecture and it appears that Nintendo is headed in the same direction. The expected useful life of a Bluray disc is as low as 15 years FYI.
