... And nothing of value was lost. If it's detremental to your business to not be able to track users on such a granular level, it's a bad business. I'm sure Facebook will survive here. 100% biased, can't stand that company.
Except that Apple still allows tracking on this granular level, it's just that now they have to explicitly ask users to allow this.
Says a lot about Facebook's (and others) business model if it only works when the vast majority of users are mostly unaware of the amount of tracking they do, but the minute you make these users aware of the tracking and ask for their permission, the business model falls apart.