Plurals do not take apostrophes. It is the possessive aspect of “Freepers’” that takes the apostrophe, not the plural aspect.
Just pointing out the exception to the rule of plurals. LOL
And what about the word they’re. I see a plural and an apostrophe (choose one: there, they’re, their) ;-)
Sometimes rules are helpful and sometime rules confuse.
I’m thinking of people who don’t understand decimals who tell me the rules of decimals all work backwards to the right of the decimal. The worst rule ever.