Cloudflare Onion Service is a free solution that offers safe access to content via the Tor network, without going through an exit node. The idea can be implemented by anyone, and it is currently available to all customers for free. The company does not control any entry, relay or exit nodes, so no new traffic is introduced. Users can enjoy improved security and performance without having to pick crosswalks, street signs, store fronts, cars, buses or whatnot in CAPTCHAs. The feature enables more fine-grained rate-limiting to prevent malicious traffic at the same time.
Source: https://www.bleepingcomputer.com/news/security/cloudflare-ends-captchas-for-tor-users-while-blocking-bad-actors/