> But that is marketing not coding.

it's the network effect.

If normies who don't care for things (which is most people tbh) don't decide to switch, do you, as a techie/early adopter, just turn off whatsapp and disconnect with your normie friends? You are unlikely to be important enough in the friend group to force a switch, not to mention that this needs to happen enmass for a swing in the network effect to happen.