I haven't seen any evidence this is a case where someone "makes a few posts" and solicits new members "on a regular basis". I've seen several hundred posts. And only 2-3 reports of unsolicited AAS recommendations via PM. I don't know the motivations either. But no one should ever place themselves in such a situation either.I have no idea what anyone's motivations are or were but most of these women were completely new to the world of AAS. Make a few posts touting your vast experience and offering helpful advice to the newcomers. Gain their trust and then within a few weeks PM them a private source.
If a guy were doing this exact same thing to new male members on a regular basis he would be called out by multiple people on the board once it was discovered. To me this shouldn't be any different just because females are involved on both sides of the PM's.
All of the undisclosed connections to sources is reason to be suspicious of the motives of many.