There's a public log of it: https://www.openstreetmap.org/user_blocks/
It lists 20 per page. The navigation is at the bottom of the page.
There's 230 pages, so that's about 4600 banned users.
(There are many instances of a single person having created multiple blocked accounts though)
Mostly it's a lot of effort to be a barely visible vandal, so people just go away.
There's a public log of it: https://www.openstreetmap.org/user_blocks/