Maybe it is now. I remember though when v21 was announced, and when it released, how many people were up in arms because they “valued” terrains and interiors. I can’t remember if I was around when B4v21 became a thing, but I imagine back then it was to have access to terrains and interiors.
I’m surprised that Badspot doesn’t do anything about it though. Someone mentioned they use their own master server for the authentication? Doesn’t that mean you don’t need a key, and can essentially play an outdated version of Blockland for free?