I can't help thinking more startups need greybeards around. (Of which, realistically, I'm now one.)

Largest table 100 million rows and they were paying 6 figures for database services annually? I have one now that sits happily enough on an 8yo laptop. I've worked on systems that had similar scale tables chugging along on very average for 20 years ago MSSQL 2000 boxes. There just isn't a need for cloud scale systems and cloud scale bills for that data volume.

The problems they're describing should never have got that far without an experienced hand pointing out they didn't make sense, and if they'd hired that greybeard they'd have spotted it long before.