For many years, they were consistently and very diplomatically saying that they had no plans to offer Backblaze Personal Backup to Linux users, because Linux users would use a disproportionately large amount of storage and it wouldn't make sense to offer them a flat-rate alternative to the pay-per-GB B2 option.

e.g. https://www.reddit.com/r/backblaze/comments/jsrqoz/personal_...

It seems that they may be changing their tune, at least as of a few months ago: https://www.reddit.com/r/backblaze/comments/m3xynu/backblaze...