I’m unsympathetic to the “oh no the cloud” mindset. I’ve worked at companies that have made on-premise patches to FOSS since the 90s. Can you imagine if Linux required you to make the source available of all software you ran on it? Or MySQL? Or Perl/PHP? I can vaguely see the point of the AGPL for things like web front end stuff where there’s a blurry line between you visitor merely visiting your site and you distributing the software to them. But that’s just madness for infrastructure code.
And I’ll bet that the MongoDB team has used lots of FOSS that they didn’t financially support, so I see it as whining when they complain about others doing the same.