Not sure about <blink>, but I sampled a few random sites from their gallery[1] and all of them have <marquee>. <marquee> is deprecated[2] and no longer scrolls in Firefox, but still works in Chrome.

[1] https://neocities.org/browse

[2] https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/...

Neocities just hosts web sites. It's up for the author of the site to write a page with <blink> (if they really want to), then for the browser that visitors use to visit that site to implement its functionality. The web host has nothing to do with it.