friendsfirst

Yes, it's already a huge problem but the ad-networks are not talking about it.
I've also written to SquareSpace because it should not be too hard getting Conversion API working with SS websites. Consider that there are 3rd party plugins for wordpress that enable this functionality.
In terms of the actual implementation on SS client side it should literally be just adding the authorization token, but there will be some programming needed.
Typically you are going to be losing 20-30% of conversions tracking to IOS but other providers will follow suite, whether browser or tech based, for example Firefox already blocks the trackers.
You can send a max of 8 events, custom conversions will basically only fire through browser. Pixel events will only fire when there are no ad-blockers or other things in place. That is when the server side will fall-back.
This has been going on for at least 2 years. Expect once implemented your conversions to go up.
Or at the moment just remove Apple devices from all campaign targeting.
Glyn