While we're narcing on Minecraft launchers, may as well look into tlauncher as well, I hear that one's been on AUR since at least 2015, and possibly supports the same "offline" mode.

On Thursday, May 06, 2021 at 6:59 PM, notify--- via aur-requests <aur-requests@lists.archlinux.org (mailto:aur-requests@lists.archlinux.org)> wrote: xcfrg [1] filed a deletion request for multimc-lhaus-git [2]:

This package allows one to play minecraft without purchase in full (not demo mode), making it illegal and piracy. You can find the offending code here, https://github.com/lhaus/MultiMC/commit/1642383dcfe9f9e4b0edfb49b6e6803e3c79....

[1] https://aur.archlinux.org/account/xcfrg/ [2] https://aur.archlinux.org/pkgbase/multimc-lhaus-git/