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."

It's in your bio