Best way to explain is probably not explain at all in the beginning and let them create an account in a well federated instance. That will not make them confused and learn by using it.

Still onlyfans exists.

if you’re a nerd is there any reason to prefer Kagi than searXNG

it’s different than karma. points from every post have to be added to get the “karma”, which may can be done unofficially by using some scripts, but officially lemmy doesn’t do that,