Can anyone confirm

If the portal scam has been fixed? Tried trading east for west dragon a couple of times with people on here. They were always using portal and I was never trading with them but their friends. They refused to accept 1st and basically just declined the trade and said that they didn't need it anymore.

How the scam works I have no idea but it's something about accepting 1st. Then a friend does something with portal meaning you can't jump and leave you seat or click cancel on the trade window.

Is this still a thing?