4KHDHub was a DDL site with direct downloads, not torrenting. They had remuxes of movies in 4K, 1080p, and 720p. The site is down now, which sucks.
I loved it for two reasons. First, you didn't need a debrid subscription when you were streaming the movies from that website using a Stremio addon. Second, it was actually fast since it wasn't torrenting. Torrentio was painfully slow at least for me.
When the site went down, all the addons that relied on it lost their 4KHDHub sources. Some movies still have them, but most don't. the sources just got replaced with whatever the addon could find instead.
Yeah, the replacements work the same but it just doesn't feel the same. I don't have the reason why it got taken down, maybe it's just temporary or if it's permanent.
Who knows? They probably got taken down by some billion dollar companies drowning in an absolute pile of money bills.