Fake users and scammers

It seems that there are quite a few members on here some certified as well, that are not who they say they are. I have had some add me as a friend and start chatting and then ask you to start chatting in off site apps, this rings alram bells with me especially if you have only ever exchanged the odd pleasentry, I have checked out there photos they have on profile and some of them come back as internet porn stars, ( and then I wonder why would some one in this line of work want to cht to a fat old male nudist especially when they are so young). I have strung some of them along in chat only to eventually get the crypto investment speech. Anyone else experiencing this ?