The elephant in the room is that this happens because these companies are too big. They command such monopolies over their walled gardens that everyone must adv

The elephant in the room is that this happens because these companies are too big. They command such monopolies over their walled gardens that everyone must advertise with them, so there is no requirement to provide customer service to any but the largest accounts. With many smaller companies in a competitive environment, some would be forced to provide a good customer experience to differentiate their service. Theoretically, at least. (Note the advertisers are the customers, not the users.)