> People simply love having all their eggs in one basket

It's more accurate to say that people don't like having twelve different interfaces that all do the same thing.

The proper way to do this is, of course, to have a single interface (i.e. a user agent) that interfaces with multiple services using a standard protocol. But every proprietary service wants you to use their app, and that's the thing people hate.

But the services are being dumb, because everyone except for the largest incumbent is better off to give the people what they want. The one that wins is the one with the largest network effect, which means you're either the biggest already or you're better off to implement a standard along with everyone else who isn't the biggest so that in combination you have the biggest network, since otherwise you won't and then you lose.