It would be nice to see projects like this with all the leaks we have had over the years if not for the legal bullshit. Or even just a code review to see what kind of weird shit devs used to do.
The latest video by @Sora_Sakurai finally shows off footage of the elusive "Dragon King: The Fighting Game!", a super early prototype of Super Smash Bros before they settled on using Nintendo characters!
Ideally IP laws would be such that this would be considered public domain by now. The game came out in 1995, so it's almost 30 years old and Sony isn't selling it anymore. Surely that was a long enough legal protection.