@charliebrownau @niko @charliebrownau @ryo @udon The description reads
"Fork of PolyMC that adds Ely.by support and allows you to use offline mode without an account."
I looked into Ely.by and it's essentially alternative auth & skin services outside of Mojang/Microsoft.

Also, supposedly PolyMC is semi dead and the new project is now Prism Launcher. Apparently PolyMC's lead dev made some remarks that don't conform with far-left ideologies so they forked it.
Now there's PollyMC with 2 L's, adding offline support. The actual packages are `aur/pollymc` and `aur/pollymc-bin`.