I had a back and forth with them about .git folders a couple of years back and their defence was something like "we are a consumer product - not a professional developer product. Pay for our business offering"
But if that's truly their stance, then they are being deceptive about their non-business offering at the point of sale.
EDIT - see my other comment where I found the actual email
Well I do pay for their business product, I have a "Business Groups" package with a few dozen endpoints all backing up for $99/year per machine.
According to support's reply just now, my backups are crippled just like every other customer. No git, no cloud synced folders, even if those folders are fully downloaded locally.
(This is also my personal backup strategy for iCloud Drive: one Mac is set to fully download complete iCloud contents, and that Mac backs up to Backblaze.)
Professional? We indeed use git at the company where I work, but there we have a dedicated backup system used by professionals. No BB involved.
I, on the other hand, as a private consumer, use git for all my hobby projects and note-taking. And my language learning. Of course I do, or I couldn't keep track of what I'm doing over the years, and I wouldn't be able to sort things out. There's nothing professional there, are BB saying that if you try to do something in an orderly and controlled manner, then it's "professional" and shouldn't be backed up? If that's their stance then no wonder people are leaving BB. I for sure won't ever recommend them again.
But if that's truly their stance, then they are being deceptive about their non-business offering at the point of sale.
EDIT - see my other comment where I found the actual email