Quite frankly no one should be using captchas at all. They are mostly pointless, and AI’s have reached the point of being able to solve them. It’s mostly just a gratis thing at this point… The illusion of trust and safety, probably for both users and providers.
Could be it’s a requirements for their payment processor, and details like that aren’t something you talk openly about freely.
Also, you will have sites that u lock will break beyond repair, so try is the correct word. I know this well from using Brave, which is even less than uBlock does, and even then some sites are still broken and requires the shields turned off. Just an unfortunate reality with today’s web.