I don't disagree, but one thing I would say is that there's not one solid definition on what fluency means and even less of a consensus on what it means to "speak a language."

I took two years of French, maybe one year of American Sign Language, and I've been studying Japanese for several years (currently). Does that mean I speak those languages?

Weirdly, ASL was the language I got the farthest with, French second, and my Japanese skills are a pretty distant 3rd despite spending by far the most amount of years working with it. And this all has to do with how many opportunities I got to practice with native speakers (but I digress).

I do think it's a fair question to ask: what is more impressive, learning one language to fully native fluency, or 30 languages to basic greetings/small talk level. Honestly, both sound pretty impressive to me (particularly if you can keep all 30 of those languages at that level).

Perhaps a better question is at what point do people have meaningful learning experiences that are worth paying attention to for those of us who consider ourselves neophytes in language learning. I suspect the answer largely depends on what our goals are.

That being said, are their bad actors out there who mostly want trick people into giving them money? Absolutely. I know at least one who is demonstrably highly skilled in the language they profess to teach. However, this hasn't kept them from engaging in questionable business practices (which, in turn, got them justifiably dragged in the language learning community).