They have, https://docs.google.com/document/d/1nPu6Wy4LWR66EFLeYInl3Nzz..., and reading it I have always thought it makes sense, as much sense as why Safari decided to do it. However, I don't think I have ever thoughtful discussion why their intended goal (security and privacy) is wrong or could be done in other ways.

I feel sad that each time this comes up even on HN it's always "Google, ad company, bad". There's a mention elsewhere about 30k limit being limiting. Why aren't we discussing alternative enforcement metrics, and request for inclusion?