People half-joke that coming to Fediverse is easy, all you need to do is select a provider like you do with e-mail.
In case of Lemmy this omits the part where you have to block dozens of communities because they shill for genocidal regimes and you can’t block them and their users wholesale using instances. You also have to be on a lookout for trolls that coordinate on those instances and use alts from other instances. If you aren’t careful enough your experience might be akin to a conspiracy Facebook group but obviously it’s users fault.
Mastodon doesn’t have this issue despite using same Activity Pub framework.
Kbin doesn’t have it.
It’s Lemmy developers and instances that somehow ended up with staggering amount of tankie trolls, to the extent that exceeds even alt-right trolls on Reddit.
Telling people to start their own instances is acknowledging that the issue is so widespread that there are no instances with sane policies.
Fascism is inherently anti-democratic, communism isn’t. I know communism is a shorthand for stalinism, maoism and other totalitarian ideologies that use socialist facade (similar to national socialism) but it’s worth to make an effort not to discredit the whole idea.