So everybody else's newsletters go to trash except theirs?
https://github.com/stevenirby/unfuckemail/blob/master/filter...
https://github.com/stevenirby/unfuckemail/blob/master/filter...
It's probably safe to assume this is a marketing trick, though.
It's likely they thought: "What if our existing users/subscribers use these filters? Our own emails will end up archived?! No we can't have that..." and thus they fell into a trap of their own making. Perhaps it's 'lawful evil' to think their own mailing lists are good and everyone else's are bad? Lol.