Do you have a source for this? I got the impression at the time that there was some commissioning of his services, but that they didn't like the report. But he publishes work, and released the report, which forced them to deal with it.

Every distributed tech fails when he test it, but the tenor and nature of the report for MongoDB was different. It basically said between the lines "do not use this product".

MongoDB has a history of really crappy persistence decisions and silently failed writes, and as soon as it gets publicized saying "we fixed it in the next release". The same thing happened here of course. I simply don't trust the software or the company.

Mysql has the same annoying pattern in its history, although I have more confidence in the software because of the sheer number of users.

Still, I would probably pick PostgreSQL for both relation and document stores.