Wow, the documents for the user blocks are very thorough. Here is a fun snippet that (blocked) user sorein sent to the OSM Data Working Group:
"YOU MORON WHO PROMISED T INTERMEDIATE BETWEEN ME AND THE GYPSIES TAKING OVER IN THE ROMANIAN NEWSLETTER, AND THEN YOU JUST RUDELY FORGOT NEED TO STOP!!! GO DO A JOB FOR WHICH YOU ARTE QUALIFIED"
Interestingly, I'm at that unproductive phase right now. On one hand, I could fix this fast and ugly, but then my code is going to look no different then all the code I go home and complain about. On the other hand, I can try to make my code really nice and abstracted with well thought out design patterns like <golden-coworker>'s. So, on one hand I'm a hypocrite and on the other hand I'm slow and hardly productive because I am just learning design patterns and no matter how many times I refactor my code it never looks as good as <golden-coworkers>'s. How did you get out of this stage? Please help.
I was going to make a joke, but actually a good answer to this is that users could just direct people to checkout their blog linked in their bio. This is assuming the person you are responding to didn't mean block all URLs from the site; just from tweets.
Technically it doesn't solve the scam problem though:
"I'm definitely the real Elon Musk. No question about it. Click the link in my bio to get 40 ETH, but you need to send me 20 ETH first so that I can verify things."
"YOU MORON WHO PROMISED T INTERMEDIATE BETWEEN ME AND THE GYPSIES TAKING OVER IN THE ROMANIAN NEWSLETTER, AND THEN YOU JUST RUDELY FORGOT NEED TO STOP!!! GO DO A JOB FOR WHICH YOU ARTE QUALIFIED"