In exchange, we are exposed to a minimal amount of comment spam. If it's anything like email, systems like captcha prevent 99.9% of spam messages.
Besides, how often do you see captchas anyway? If you're not using super privacy / tracking protective browsers, they'll remain hidden for the most part, and the ones you see are the simple 'check this box' variety.
Because of how Cloudflare works, and how ubiquitous they are, specifically, internet users from a non-western country can get bombarded with recapchas. It is so prevalent and annoying that I had to resort using VPN (located on a western country), to avoid this nuisance.
It literally breaks the internet for me, I had to go through recapchas 12-15 times a day.
Besides, how often do you see captchas anyway? If you're not using super privacy / tracking protective browsers, they'll remain hidden for the most part, and the ones you see are the simple 'check this box' variety.