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.

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

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

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.