SMBX was actually taken down by Nintendo years ago, back when Redigit still ran the website. The reason it's back up is just cause people in the community decided to bite the bullet and just bring it back. I do think Nintendo knows about this though, but although they haven't taken this site down yet they do sometimes demonetize people on Youtube who make SMBX videos.
I wouldn't worry about it though. Until they decide to shut us down you should just enjoy being part of the community (even then we'll probably find a new sparring location)
I shall return with a new episode...... soon.
Check out my Mega Man Maker levels!
Breakneck Quarry: ID 189213
Flash Freeze: Coming soon