Taking money for a 30-year-old movie is pretty much government-assisted stealing, if I’m honest. Copyright in the USA originally had a term of 14 years.
My partner is very tuned into the various ethical mishaps happening in the world and keeps me apprised of which companies are doing shitty stuff and which people/companies I should stop supporting.
Problem: the set of companies you shouldn’t support due to unethical behavior is pretty much all of them. As the saying goes, there is no ethical consumption under capitalism. If doing business with someone with blood on their hands puts blood on your hands, then only the hands of hermits and children are clean.
This is one of the reasons why I use free and open source software wherever possible, but very few games are FOSS and most of them were commercial before being FOSSified (e.g. Doom).
You can operate without a BIOS if you implement a compatible one from scratch. That’s how IBM PC clones came to exist.
But an encryption key has to be exactly the same as the original, and although I doubt it can be copyrighted, it is definitely a technological protection measure per DMCA.
Try not to have an overly rosy retrospection about this. There were plenty of crappy, cash-grabby games in decades past. We just don’t remember them because they were crappy, cash-grabby, and not worth remembering. They hadn’t invented microtransactions yet, but that’s just one more flavor of crappiness.