For me it is to store encrypted backups of TBs of data on Google Drive. Simply because its the cheapest option (although its slow AF). I'd like to switch to something else if either the competition lowers prices or I make more monies :P
Even for 5TB Google is cheaper. Unless B2 have an option for annual pricing and its not obvious from the pricing page.
For me "TBs" starts at 10TB :-) But, yes, even 2TB is terabytes, of course. My bad.