Why do you think it won't hold water legally? There's a case going right now against Github Copilot for scraping GPL licences code, even spitting it back out verbatim, and not making "open" AI actually open.
Creative Commons is not a joke licence. It actually is used by artists, authors, and other creative types.
Imagine Maven or another company doing the same shit they just did and it coming to light there were a bunch of noncommercially licences content in there. The authors could band together for a class action lawsuit and sue their asses. Given the reaction of users here and on mastodon, I wouldn't even be surprised if it did happen.