Any organization that continues to send marketing material after someone clicks Unsubscribe (with maybe a grace period of a few hours) should have all of their email considered spam for everyone by default. If they continue or ever start sending marketing materials afterwards because of some new bullshit category, all of their email should be considered spam by default as well. If their Unsubscribe process is more complicated than one or two clicks, you should be able to report this as well, and... you guessed it, I think all of their emails should be considered spam by default for everyone.

Obviously I don't expect Gmail to do actually do this (except maybe by accident sometimes lol). But I wish they did.