I've seen this project here: Petition to have geometry dash back and am wondering, why has the scratch team removed these projects, is it a legal issue, an error, or what? If it is a copyright issue, scratch team, please explain it here, if it is an error, please fix it as soon as possible, and if otherwise, please explain the issue. If anyone from the scratch team sees this, please find out what happened and tell us.

Found the reason. Sadly, RobTop called a DMCA takedown request to all of them. You can still find them under different names though.
DMCA takedown request