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I have never seen an xcancel captcha..

Neither do I - just the usual "verifying your request" screen: https://i.ibb.co/MyWRVtFj/xc.jpg

Which is a PoW CAPTCHA, but a CAPTCHA nonetheless.

However, if your JS is disabled (or if you're running LibreJS), you do get redirected to a CAPTCHA which only works sometimes.