As far as I'm aware, they use some sort of global data for spam blocking, but certain bulk senders are exempt from being marked spam. For instance, I had to cre

As far as I'm aware, they use some sort of global data for spam blocking, but certain bulk senders are exempt from being marked spam. For instance, I had to create a Paypal account for some purchase, and I marked everything they send me as spam, but there's no way Google will consider their emails to be spam for everyone else by default, even if I got 1000 people to do the same thing. But I'm sure if I got 1000 people to mark some rando as spam, they'd be in a much more precarious situation. Disclaimer: I worked for Google but never anything related to this.