Most linux distributions ship with outdated versions of Anki.
Your tar.gz build doesn’t provide app-armor protection, which can be helpful against malicious 3rd party addons and it’s not guaranteed, that your tar.gz build will run on every distribution.
Flatpak does provide both. App-armor protection and a working application on every distribution that supports flatpak
But there is no official flatpak build of Anki.
Could you create an official supported flatpak build for anki on a regular basis and put the link to it and its sha256 hash on your anki website so that everyone sees, that it is official?