Recently I ran into an issue where running solbuild init failed. This was after the outage.
The manual workaround was to delete /var/lib/solbuild/images/unstable-x86_64.img.xz and run the command again

Proposed solution: Add logic to solbuild init that if it gets an error trying to uncompress the repo archive, that it offers the user an action to fix.

Logic flow:

When running solbuild init
If an error is encountered when trying to decompress the downloaded repo archive file
Check /var/lib/solbuild/images for a pre-existing file like unstable-x86_64.img.xz
Check if that file is valid. If not:
Offer user to delete that file,

If user chooses no, exit with warning that things may still be bork
If yes, delete that file. Rerun solbuild init, check for success.