My home setup is a plain old Xubuntu installation; for browsing I'm running Firefox with uBlock Origin. Nothing fancy or too far out of the ordinary.

Lately I've experienced the same thing, often 3-4 rounds of captcha challenges, sometimes more. It's painful from UX standpoint and insulting as user. I've been trying to avoid any site that uses them, they're very user-hostile, but there's only so much you can avoid.