It is always worth pointing out that the complex dark-pattern filled forms that many sites use are there choice and not impressed by the relevant legislation.
They could just make it all opt in/out with a single click, but they know that without the trickery very few users will do opt in to being stalked so instead they try make it as difficult as possible in the hope that you agree to everything either accidentally or just because you are such of it and want the form to go away. I just back away from sites like that and in particularly egregious cases I've blocked them at the network level with a DNS blacklist: the information I'm looking for has always also been available somewhere else less irritating.