Surely the experienced ones who don't know basic stuff like this is because they just don't care about seeing it from the providers point of view? I doubt they'll bother to watch a youtube video about it.
Good point about there probably being a lot of newbies on here who don't post, I only found this place after I'd been doing it for over a year and had already learnt a lot from my own experiences and conversations during bookings.
Not in my experience, they have made their own assumptions based on whatever they have seen or not seen in the media, and even sometimes on forums - including this forum. Sometimes assumptions are formed from what they want to believe, disbelieve, misunderstand. Most weeks I provide someone with some education on something to do with sex, sex work, safety - because it comes up in the booking, sometimes even long term regulars and or forum readers.
Also there are UKP members who go straight to whatever thread or forum section that they prefer, which is why there can be duplicate threads on the same topic in different parts of the forum.