That's what "1" in the "3-2-1" backup strategy stands for, a true offsite backup (preferably continent where you do not reside) For "2" I would still deploy a local offsite at someone's house for quick disaster recovery.
Downloading your 10TB data from B2 (or even requesting a tarball HDD from them) is costlier than recovering from an offsite backup facility within an hour's reach.
I guess Valve being the escrow, they may hold future revenue payout from sale of other R* games