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.

Just nitter.net is better than both of them.

lightbrd also needs cloudflare captcha

Try nitter.tiekoetter.com.

That also uses a captcha, not Cloudflare, but Anubis