I think you'll find a lot more leftists interested in platforms that are not powered solely by money and profit. Lemmy, much like Mastodon and other federated platforms, only need instances to run to be usable. It doesn't require millions of dollars to keep it afloat.
Generally speaking centrist and right wingers, especially in Western countries, tend to be very capitalist. They only understand the value in terms of money.
But I think this is a bit of a biased comment. Many right wingers went on to fringe corners of the internet, Places like voat, 8chan, Trump's twitter (what's it called?)... Basically all the places where QAnon festered. They believe that mainstream social media is censoring right-wing ideas. I don't really see them favor platforms that are "capitalist".
they were looking for unmoderated corners, not for places not powered by money and profit. Which I find orthogonal to the comment from OP. That there's some overlap on the end result doesn't mean OP was biased at all.
You hit the nail on the head there. There are lots of reasons to seek out a less corporate, less mainstream online community. No need to invoke any horseshoe theories.
So far I see very little evidence of QAnon type ratholes here, probably in no small part because the platform doesn't really seem conducive to paranoid echo chamber type activity.