Nemlei erased all the games (not only the older ones) and except for Jack-in-a-castle, they are all free, and you are allowed to use copyrighted music as long as you don't market the product
And for Jack_in_a_castle, it was on Steam, and steam usually verifies if there's any copyrighted content in the games
It's also known that Nemlei gave the rights on TCOAAL to Kit9, and Kit9 published a statement saying that Nemlei terminated her online presence due to doxxing and death threats (because of the incest ending in TCOAAL chap 2)