I've set-up #PiHole using the default block list.

One thing I've noticed is that sites that use cookielaw.org for managing cookie opt-in/out now break in terms of allowing me to opt-out.

This appears to be a known issue - https://github.com/StevenBlack/hosts/issues/2257

I'm not sure if I want to add the domain to an allow list or not.

Unblocking it would make some cookie opt-out systems work again...