>So why didn't crypto block or ban

I think you have a misunderstanding of the technology.

> So why didn't crypto block or ban them from doing these scams using their technology?

Bitcoin code is open-source. How do you prevent someone from using open-source?

This is like asking why the US government doesn't ban criminals from using the dollar to commit crimes.

>So why didn't crypto block or ban them from doing these scams using their technology?

And here we have a neat example of how this site, called "hacker news" of all things, can sometimes take on a absurdly idiotic hive-mind approach to some technology X where brainless hostility combines with laughable ignorance to reject something without knowing the first thing about it, even when the thing is emphatically a practical solution to a widely discussed problem.