They’re pretty determined, with March being the best rumored rollout so far. Delays are around SKAdNetwork, as the change destroys traditional attribution and alters how ads are run. They gave networks and publishers more time to adapt, but there won’t be any more delays

Antitrust risk could be a factor, as the preferred treatment of ASA seems dubious - but the change seems to be coming regardless

Since the US government is not doing much on that front, we're now looking to Apple to save us...

Of course, the other half of people are running Android and I don't see Google getting on that bandwagon.