I've find a way to do it (https://scratch.mit.edu/projects/319966312/) but it's just so slow.

From what I know, there's no way to get a list of every single Scratcher, and doing it manually would be pretty much impossible since there are tens of millions of Scratch accounts out there

It is impossible.

What you have done is just add someone's username on a list that has your name. Even if every user on Scratch saw the project, the modified list stayed locally and not on the server. Hence, you can't do that.

If you joined Scratch months ago, it is actually possible to list users that viewed on a project using cloud lists. Cloud lists is a list that stores the list on the server using cloud variables.

Hans5958 wrote:

It is impossible.

What you have done is just add someone's username on a list that has your name. Even if every user on Scratch saw the project, the modified list stayed locally and not on the server. Hence, you can't do that.

If you joined Scratch months ago, it is actually possible to list users that viewed on a project using cloud lists. Cloud lists is a list that stores the list on the server using cloud variables.

I know, I mean scratcher, not new scratcher.

As others have said, this seems like it'd be an impossible task. According to the Statistics page, there are over 42 million users registered.

If you're willing to go with a smaller, more specific list, then you'll have a more achievable goal.
Something like “Most frequent forum posters from (date) to (date)” or “All Top Loved users from (date) to (date)” could work. If you were still set on getting a large amount of users, then you could do this for multiple different categories and then combine them for a big list. You'd never be able to get every user on the site, though.