chucklehead2

That’s kind of the point. A lot of models don’t want their pics reposted onto Instagram etc. to keep their identity and content private. 

Don't they want to sell more content though? Or at least get more people into the fetish?

Not all of them, no.  Their argument is often that if they wanted the advertising they'd do it themselves.

Imo it is unrealistic of them to expect what they upload to never end up anywhere else, especially if it's public.  Though not entirely the same, it's like there being no reasonable expectation of privacy when out in public in regards to being filmed or photographed.  The only way to ensure your content doesn't end up in places you don't want it to is to never share it yourself in the first place.  Privacy experts say the same thing about data security.

Other models either don't care or like the promotion (sometimes only as long as they are credited).  I've even seen some models like it because it allows them to redownload content they lost.

If you want to be mindful of what they want, and you don't see if they've stated it anywhere already, just ask them.

Believe me, we have many things we are insecure about 

Have you met a female?  We're kinda like humans, a wiiiide range of feelings and emotions lol