I got scam by CardSellerN1 : https://bitcointalk.org/index.php?action=profile;u=3516331

I already sent him 2 cashapp account.
He need another cashapp but do not want to pay the money.
He didn't pay $30
see proof :  https://ibb.co/0mrSFC9

he is scamming people with self-moderated thread.
see his self-moderated topic https://bitcointalk.org/index.php?topic=5420400.msg61270528#msg61270528
https://ibb.co/SsCtrNG

My question is why he tried to buy from me when he already selling cashapp before.
i is a scammer 100%