Just one man's opinion here, who is a veteran hobbyist of nearly 30 years (hobby time, not age).
There's a lot of trafficking in this hobby - it's just that most of the women on here aren't part of it.
AMP's are probably 80% trafficked in some form or another. For that matter so are Asian nail salon attendants. Those places are always one raid away from nonexistence.
When a new girl shows up who is 18 or 19, and knows all the acronyms and terminology of the hobby - she's most likely pimped or 'managed' in some form or another. Or MAYBE she's 18....and maybe not. There are no shortage of stories of underage girls being trafficked; Google is your friend in this matter. Does that mean all of them are? Nope. Nothing I said was 'all.'
I prefer not to involve myself in trafficking situations (and yes, I recently posted a review on an AMP - hadn't been to one in years, but, sometimes I'm as much of a hypocrite as the next guy). Hence, I tend to stick to women who are at least in their mid 20s if not their 30s - usually those women are making an independent and informed decision to be part of this hobby.
Again, just one man's opinion....but if you hobby for a long time, and are somewhat consistent about it, at some point you're going to have had an encounter with a girl/woman who was not necessarily doing this of her own volition....sometimes you can tell and sometimes you can't, but the law of large numbers comes into play.