My periodic reminder to blogs and news outlets that, if you have #RSS or Atom feeds, you should remember to exclude those URLs from your frontend-based verifications.
If you want to control traffic on machine-to-machine endpoints, use standard throttling and rate limiting - not CAPTCHAs nor other frontend challenges.
My Miniflux list needs to be periodically pruned from dead links because, as websites increasingly add Anubis, Cloudflare challenges, hCAPTCHA etc. to their pages, they often forget that they also have some RSS paths to maintain - and that aggregators break if you return some random HTML to them.