The existence of this APIs will be very useful to argue that server-side data collection is not reasonable under GDPR anymore.
I hope it gets implemented because it will give significant ammunition to us in Europe to make server-side behaviour tracking marked as unreasonable under GDPR provisions.
The one that's now moving to the client when it comes to Ad serve. This makes a case for an Ad network tracking data collection much weaker since GDPR demands minimum data collection to satisfy a given business goal.
This will make it much easier for is to argue that server side behaviour data collection is outright unnecessary and thus illegal for many ad services.
I hope it gets implemented because it will give significant ammunition to us in Europe to make server-side behaviour tracking marked as unreasonable under GDPR provisions.