Yes, I do agree that repetitive ideas will just make the original projects in its worst case but if the developers will innovate a projects I guess it is fine as long as it is a collaboration. The repetitive projects and old ideas must be report as plagiarism in the community if it is not informed the original ones to use it.
If there's collaborations and it will bring old projects to a much competitive updates investors will benefits,
but if there's none and just pure copycat
the project both old and new will do nothing, for sure many investors wanted to see their supported project
to progress and bring great innovations.
New project without any originality needs not to be supported, and those who are only copying old project
without informing the original creator should be tagged.
It will help to inform the community that they shouldn't bother to invest, possible scam might happen and
they will lose their money.