Maybe they are a major revenue source for Google?
I get so many spam emails with bounce addresses like jhvivisvhesnbg@aa85oc16gsbsm2ug.g8k1xdhfdya6f42b.jnwwym.8d-5df9reaw.um8.bnc.salesforce.com, and mark each one as spam. The filter never learns.
I just last week re-listened to him describe the process again. It's pretty remarkable how well he nailed it (and how many companies it applies to).
[0]https://en.m.wikipedia.org/wiki/Enshittification
Maybe they are a major revenue source for Google?