[yanmaani]

In my experience, this has gotten better. That was CloudFlare, and they've stopped now. I can't think of a single site that requires CAPTCHAs for Tor users other than archive.is, actually.

[raxi]

Almost all torrent sites. Generally, "data" sites which people love to scrape and think that Tor is a good tool for that

[foxfluff]

archive.is wastes your time on captchas even if you're not using tor

[floatingatoll]

archive.is requires captchas for iCloud Relay users as well as blocking Cloudflare DNS users, so I wouldn’t consider them to be a Tor-specific example.