They are already gone on Firefox. I had to reengineer one system to make it work. So if you’re care about compatibility, third party cookies are already effectively gone.
Isn't it the opposite? Most of Google's competitors in the ad space are very dependent on third party cookies but Google itself can get browsing information from Chrome directly.
AFAIK this is why the UK's competition authorities were hostile to Google removing third party cookies.
It’s unclear - competitors rely on 3p cookies, but abuse them. Google getting rid of them in theory levels some of the playing field - smaller companies can compete with larger ones because larger ones can no longer track users across every site where they have a pixel installed (IE fb’s massive advantage of having a pixel on virtually every website means only they know every single site you visit).
But in practice, the engineering lift and complexity of the solutions is absolutely massive, so many companies simply will not be able to play ball. Additionally, because the internet will be more private the sketchy companies doing things like fingerprinting will cease to exist. Google has never said they will kill off competing solutions that are not privacy safe (UID2), but have explicitly said they will stop any fingerprinting, cross site tracking, etc.
