We'll have a more complete answer shortly.
EDIT: This does not appear to be a widespread issue. Continuing to investigate.
EDIT2: Full response from Ammon, our CEO, at https://news.ycombinator.com/item?id=31771836
But I hope you can understand why I'm skeptical: not just because of Triplebyte's track record, but also because the customer support representative who responded to me seemed to be under the impression that this hadn't been fixed retroactively. If I'd instead gotten a response that said "hang on, that shouldn't have happened, give us some time to figure out what's going on", I would have found it a lot less concerning.
Anyway, tl;dr - see Ammon's top-level reply.