One of their mods, https://lemmy.world/u/sabbah, currently mods 54 communites despite only being on Lemmy for about a month and has never posted on c/documentaries (except for his post asking for people to join his mod team).
Final: Was going to create an issue for this on the Lemmy github, but I browsed for awhile and found that it had already been done. If anyone wants to continue the discussion there, here it is - https://github.com/LemmyNet/lemmy/issues/3452
Perhap we need another issue for the problem in the original edit (It being impossible currently to remove a 'founding' mod without destroying either the community of their account)
In most cases they are not going to respond either because they are inactive or they are intentionally squatting the names for whatever reason. They can't respond or they don't want to.