Is there a use case for third party cookies outside of ad tracking? I’ve had it disabled for years and don’t recall it breaking any website I actually care to use.
Once case is iframing a site where people will get logged-in behavior without requiring them to log in to each site individually. For example, an embedded video player that wants to disable ads for subscribers or a micropayments service that needs to recognize which account to charge.
(Disclosure: I work on ads at Google, speaking only for myself)
I had to enable third party cookies to log into Pearson’s online learning garbage. It appears the use case here is standing up poorly designed websites.
Requiring opt-out (hidden at that!) is statistically the same as not supporting it. Most users will not know about this or be technically inclined enough to change it.
Google knows this. Some analyst or PM modeled it.
edit: Hello Google employees downvoting me. I'm confident nobody else on the planet wants this the way you do. You can censor me, an individual voice. But the world doesn't like or need this, and they're waking up. As are our legislators. Change your behavior and innovate in other areas that benefit society. (There are so many - nearly limitless!) The clock is ticking. They're building the antitrust cases as we speak, and this is the road you're actively choosing to go down. Not a good look, not the best step forward. I really do want the Google of 2005 to succeed; all of this has just been a misstep. Microsoft in 2021 is so much better than Microsoft of years past. Google could do the same. Don't be evil.