Not really true. As someone that once argued with a moderator about the most mundane thing in the world and then proceeded to get banned from 5+ subs... its only "open" in name only.
There's a well established group of terminally online individuals that "manage" to "moderate" dozens of subreddits.
I will openly admit there are gangs of moderators that control the top 20+ subs on there. I got kicked out of several just because I posted in a "covid-is-BS" sub that they were all idiots. Just because I was even -posting- in one of the subs that ultimately got banned, I got banned. I wrote 4 or 5 of those "cross pollinating" moderators and told them that it was horseshit and they were acting like babies & cowards and not sane moderators, as they hadn't even read my comment. one of them replied and did say it was BS and unblocked account in like 3 of the subs that he was a moderator of.
There's a well established group of terminally online individuals that "manage" to "moderate" dozens of subreddits.