rsync.net is a very different product though.

I recently evaluated a bunch of cloud storage/backup services. rsync.net is a ssh-accessible ZFS filesystem (including support for zfs send/recv) in the cloud, B2 is object storage.

rsync.net has a cheaper version aimed at people doing borg backups. Unfortunately it's still 3x the cost of B2 for 1TB of data.

It's not just that. It's also that I don't really trust anything centralized anymore, and internet speeds are such that homegrown solutions are becoming more and more attractive. Another benefit is that I'll also be able to easily backup my Linux machines, which BB currently does not support. At the moment I just periodically copy data to windows on cron so that it's backed up - not ideal to say the least.