I've noticed the same thing you have, but I suspect it has a different explanation. I think it's more an echo chamber thing. People have said variations of this for a while now in HN comment threads, on reddit and here. And there's a snowball effect from more people saying it.
But there's been a throughline of bizarrely apathetic and insubstantial low effort comments. That's the one thing that has tied them together, which is why I think they are echo-chambery. Just for one example: one guy just never read a 990 before (a standard nonprofit form), and read Mozilla's and thought it was a conspiracy, and wrote an anti-Mozilla blog post. And then someone linked to that on Lemmy and said it was shady finances. Tons of upvotes.
But I'm convinced that no one reads through these links, including the people posting them. Because it takes two seconds to realize they are nonsense. But it doesn't stop them from getting upvoted.
So my theory is echo chamber.