Isn't drastic copyrighted?

[Randogaming]

If so, why hasn't vds on gplay, which doesn't even try to hide the fact that it is a shameless copy, I fell for it to be honest, been taken down yet?

[kaikun97]

Its a waste of time trying to get countless copies taken off the Play Store, and most of the time Google will not take any action regardless which makes the effort useless.

Since Drastic DS is already well known and these copies are based on older broken versions, so its not considered a big issue.