I've opened up the pricing page, and it seems it is much more expensive then their mainstream competitor Backblaze.
For a terabyte of backup for a month, rsync.net would charge 1024*0.012 = 12$, while Backblaze would charge 6$. Hetzner Storage Box would be only 3.20$ (+better price scaling over terabytes).
It feels like the last language one will need to learn.
It has an improved C-style syntax (if statement is similar to if expression), it has algebraic type system (enums can contain nested data) and 99.9% of the time you can write in safe mode where you are guaranteed not to segfault.
In my experience, the most readable response format are replys on some link aggregator (lemmy, hn, ...) and a link to that thread in the original post.
I've done a full day of work instead of fucking around and then went climbing. Does not happen often.