I am not going to argue about how you feel about D&D, but if that's the case for this Sven guy, then why bother acquiring the IP and the rights to use the system instead of just making a DOS3 game?
I don't think they came cheap.
Why not? Forgotten Realms are quite recognizable, it's always a way to attract more players.
This isn't pure 5e and most people probably don't care. Certainly the WotC doesn't care.
