Thanks for acknowledging your mistake. I also have a tendency to conflate rsync.net and tarsnap as I believe I learned about them at about the same time. This is despite having 2 clients to whom I have recommended rsync.net and whose backup I check each and every day.
You might not fully appreciate how graciously rsync handled this: they could have trivially won a lawsuit against you. Had you made this kind of mistake about another company’s offering, and they discovered it, you might expect to hear from lawyers very quickly.
Avoid making comments about competitors unless you are certain it is the truth.