Detection warning on Cloudflare Captcha

Was just about to visit Betanews site to check some news and I got Avast warning on Cloudflare’s Captcha page. Why? Why would captcha be a dangerous webpage? Avast 26.9, fully updated. I get these captchas more regularly now that I’m using ProtonVPN, but I never got this kind of Avast detection warning before until today.