While everybody’s right in saying text captchas are outdated, there are concerning amount of services (especially for small-mid businesses) that still use them.
Anyway, if an AI could control something like Selenium with the necessary modifications (aka not presenting itself as Selenium), I am pretty sure most of the “Click here to confirm you are an human” captchas like the cloudflare one would be defeated too.
I think the most challenging are image-based weird challenges that are difficult even to humans. The annoying ones.
To be honest, a lot of system configuration is better done on the CLI or editing configuration files manually (see the majority of the audio stack). I like that approach way more than Windows but even the System Registry in Windows is more “GUI-like” than editing ALSA files or pam.d files manually (usually on the cli as they mostly require sudo). This scares people.