I don't even bother raising it as a problem these days. More effective is to implement it exactly as specified so the designer is happy and the the managers are happy and the client is happy.
Then a month or so later, "accidentally" introduce a regression. Oops, the checkbox isn't checked by default any more! Nobody is thinking about it by then, nobody is checking it, and nobody will notice.
I had success in the past hampering the process by linking to various legislations (e.g. GDPR, CCPA) and asking my PM to reach out to legal to approve the implementation. At larger companies legal is usually pretty cautious and takes a very long time to respond.
Then a month or so later, "accidentally" introduce a regression. Oops, the checkbox isn't checked by default any more! Nobody is thinking about it by then, nobody is checking it, and nobody will notice.