Are your friends new to MMOs or internet culture in general?
ERP has always been around in every MMO I’ve played. And, well... we both know the 34th rule of the internet.
As for plogons:
You can’t prove that other people are modifying the game’s appearance. Unless, of course, you’re using the forbidden moon one. In which case, the only thing it proves is that you are modifying the game on your local device, meaning you’re the one breaking TOS and risking a ban.
So yeah, a lose-lose scenario.
Honestly, the best thing CS3 could do at this point is to introduce a Gooner Shard™.
A special in-game containment zone where all the gooners and goonettes can roam free and ERP to their hearts content without disturbing the rest of the 'tame' playerbase.