LMMS Sharing Platform (LSP) content license issues (copyright, trademark)

Hello, LSP is great! Unfortunately it hosts some copyrighted content:
https://lmms.io/lsp/?action=show&file=15389 (megaman trademark/copyright)
https://lmms.io/lsp/?action=show&file=15394 (billie eilish copyright)
[edit] https://lmms.io/lsp/?action=show&file=15370 (galantis copyright)

Some suggestions as food for thought:
1. Make by-nc-nd default, so that people who don't pay any attention to license at least don't upload a license that encourages commercial use/remixing - actions that might lead to legal trouble to people downloading from LSP and believing the license
2. Reduce the number of license options for new uploads while keeping old licenses (freesound did this to sampling+)
3. Add some kind of explanation(s) to the license choice section
4. Create a copyright report/moderation system
5. Delete copyrighted content(?)
6. Add a "fanart/unlicensed cover option (either as license or in addition to license - the latter is how blendswap does it)

The hope here is that these steps let LSP downloaders can more safely to remix without having to worry about infringing on 3rd party rights.

For reference, current license options:

Start by reviewing the LSP upload license-choice section and the three linked examples of potentially copyrighted content. The issue lists several possible directions, including license changes, explanations, reporting or moderation, and content removal; completion would require an agreed scope and a corresponding policy or platform change.

Written by the indexing model from the issue text.