I personally find the concept of OF really unfair and irritating, so I never even considered contacting an ad with a pretty girl's pic - body and face vise- with an only fan link added to it. I mean let's be honest, why should the girl with high beauty standards even consider going for a hard job such as an escort when they can sell the videos of her dancing or shaking somewhere? Or sell their feet vids and pics or almost playing with a dildo for a good amount...
Although OF users also have some troubles such as being stalked or blackmailed which is surely possible, but more than that it seems to be a lucrative side business.
I should also add there are some escorts who have OFs here and there so surely not 100% of them are fake. But the numbers are so insignificant that you can consider it as zero.
I'm happy that you also have gotten sick of them and won't contact such ads.
I absolutely hate this strategy of luring men to their OF and keep them hoping one day she might lay her eyes on them and not realizing they have spent so much on her that they could have gone to dozens of escorts with that money.