Because approximately no one wants that. Anyone who does already uses S3 etc.

I use them for the b2 bucket style storage where this happens. Its expensive per gig compared to the cost of a working personal unlimited desktop account. I like to visit their reddit page occasionally and its a constant stream of desktop client woes and stories of restoring problems and any time b2 is mentioned its like "but muh 50 terabytes" lol

They do, it's called B2 and is another product of them.