How to lie with statistics :). It's not hard to block all spam if you chuck anything you're not sure about in with the false positives. It's not that Gmail is so much better, it's that they have to care less because everyone has to deal with their dominance on the market
Edit: reading further
> By February 2024, Gmail will start to require that bulk senders:
> 1. Authenticate their email
That is already the case, as evidenced by that the blog post links to an existing help article of theirs to an existing error code that I have indeed encountered as a sender. They mention having rolled this out last year, which fits the timeline on my side.
> 2. Enable easy unsubscription
That has long been required by law. Did they not factor this in yet?!
> 3. [Stay below] a clear spam rate threshold that senders must stay under to ensure Gmail recipients aren’t bombarded with unwanted messages. This is an industry first
Here we go, this is the meat. So if someone wants to annoy you, they can sign up for your newsletter and hit the spam button and everyone will stop receiving all email from your site (such as signup confirmations, password resets... you're basically out of business).
Users do not understand the spam button is meant for spam, not for anything they don't want to receive anymore, which is why it's so useful to have an unsubscribe button in the UI that actually works, but Gmail doesn't show that (see my other comment in this thread https://news.ycombinator.com/item?id=37773525).
"Industry first" indeed... few others have the market power to demand these sorts of things and require senders to spend (wo)manpower on manually resolving delivery issues for individual receivers. If a random ISP would start doing this, the people at that ISP would just get mad that email often does not arrive. With Google, who is going to blame Google? Clearly the site you're signing up on is broken.