Is this question really appropriate? The developer is sharing a pro bono offering, where does selling anyone on it against a commercial service even come into play?
It looks like a project that must have been fun to make and could be useful for storing non-sensitive data with very little hassle. Long bucket IDs appear to leave little chance for name collision.
If you are building a piece of software that deals with anything remotely like PII or has specific availability requirements, I sincerely hope this is not something you are seriously considering (otherwise, pardon me, I hope I won’t be your user or customer), starting from the fact that you aren’t paying for it and there is no SLA.