Sure, in theory, but how do you solve a problem like this in practice? What is it about a given URL that makes it suspicious? Is there a whitelist? Because the

Sure, in theory, but how do you solve a problem like this in practice? What is it about a given URL that makes it suspicious? Is there a whitelist? Because then the press and the rest of the internet will cry censorship and stifling of innovation. Is there an algorithm? Then the scammers simply learn how to game the algorithm and defeat it easily. (This applies to some easy checks like domain registration date too.) Is it a team of humans? That's a lot of sites and a lot of humans to employ. What about user-reports? Now you have to deal with false reporting and abuse. While it's possible for some combination of approaches to succeed here, it's not nearly trivial.