Comment by freehorse

Imo the worst is recaptcha. At least with cloudflare the work you have to provide is minimal. With recaptcha it can take me much longer than 5 seconds, and lately I have trouble even completing their challenges correctly. Nowadays if I see a (recaptcha) captcha I drop the site unless I must visit it for some reason, it is not worth the time, the effort or the annoyance.