Nobody would use Gmail if it didn’t deliver messages from Facebook, same as how nobody would use iPhones if you couldn’t install Instagram and WhatsApp on them.

Nobody would use Gmail if it didn’t deliver messages from Facebook, same as how nobody would use iPhones if you couldn’t install Instagram and WhatsApp on them. Google and Meta are in the selling-access-to-eyeballs business. They don’t need to explicitly collude to keep others out of your inbox, their interests happen to be aligned here automatically.