US thing I’m guessing? Here in Sweden, we don’t get much spam mail in the first place but you simply put a “no ads” sign on your mailbox and then only get the stuff you need. The 8 years I’ve lived in my current apartment I’ve gotten like 3 things that weren’t bills and stuff I need.
In the US, conservative lawmakers have been waging a quiet war against our postal system for a while now.
Highlights: They forced it to be self-sustaining (cut federal funding), then when that didn’t kill it they forced it to, in a very short time frame, pre-fund retirement benefits ahead of time for all current and former employees.
The postal system is more or less dependent on the funds it gets from spam mailers.
Edit: To clarify, I’m not insinuating that the bulk/majority of its income is from junk mail, I’m just stating that its not nothing, so they don’t really have an incentive to kill that source if revenue.