Those who sell those photos probably care, but money is important and apparently there is a demand for it. See it like one of the extremes of our free market.
Verifications is probably only "needed" when people are going to make a meetup happen. Just posting in the forum, well does it really matter if it is a man, woman or transperson writing "Oh, that is hot" in the porn section or some strong opinions in the Dumpster Fire?
As for verifications in PM there are a number of ways, will not go over them all here.
Try to verify the ways you can if that is important to you. "Strange" images of them with a time limit for when the pic shall be in your DM might be a way.
I don't really know as I am not going to meet anyone from this place, so I never bothered to ask for verifications if we chat. If they are interesting or funny I just chat, if not I don't chat with them.
Do what feels right to you, Google "verifications internet" or something and make your own "verification procedure".
Good luck and stay safe.