They are so annoying that I block scripts of captchas in uBlock Origin. So far I've blocked the scripts of recaptcha and hcaptcha [1]. If a website uses a script captcha I leave. But recatcha told me once I was a bot, so I guess it's OK that I don't use websites that don't like bots.

[1] The 3 uBlock Origin filters:

  ||www.google.com/recaptcha/*$script,important
  ||www.recaptcha.net^$script,important
  ||hcaptcha.com^$script,important