There's a merged pull request on the void-packages repository

MultiMC mark restricted
https://github.com/void-linux/void-packages/pull/32979

Description:
We are not allowed to use the MultiMC name, artwork or API endpoints for builds from source.
Marking this package as restricted so that we won't ship any binaries for it, users can either download binaries or build the package for personal use.

Also adding it to `removed-packages` so that anyone who has it installed will get it uninstalled instead of being stuck to the version they currently have installed.

https://github.com/void-linux/void-packages/issues/32950