There are regulatory agencies which have specifically told Google it is not allowed to remove 3rd party cookies without a replacement as while Google would be able to continue to function fine, their competitors would take a major loss.
Likewise. Even despite the multiple times Mozilla manages to carefully aim at their feet before shooting, Firefox still seems like the best available alternative.
Seems like the CMA are concerned for other advertisers who profit from 3rd-party cookies, no concern for user's privacy. That poor billion dollar industry, how will it cope?