Pretty easy to say, but if someone is going to quit their job because they think the cookie banner they've been ordered to program will annoy people, they're either absurdly privileged or comically stupid.
I would never work someplace that promoted hostility to their users. I am neither privileged or stupid.
It sounds like you're at least privileged in the sense that you have the apparent option. For a lot of people it's a serious deal to pursue alternate employment, especially if the conditions they are seeking to avoid are a common practice in the industry.