Linux-Distributions have stopped shipping Anki because the build process requires to download dependencies during build time.
For example Fedora stopped at version 2.1.15. Many - if not all - distributions have security policies that doesn’t allow software to download their dependencies during build time. Arch Linux made an exception for Anki.
Could you investigate simplifying/refactoring the build process so that distributions are able to ship Anki again? This task may include communicating with distribution maintainers ask what would help them.
References
Red Hat’s Bug 1815782
Debian’s Bug 958853