The web was not competing with literally hundreds of other services with tighter branding and the weight of multi-billion dollar megacorporations pushing for their success. They have far more resources available to push their own services and have absolutely no incentive to integrate with any other service or protocol.
I wish you luck, but optimism and blind faith isn’t going to magically make WhatsApp et al go away.
Just as the Web won without a single app with a single brand for people to remember, Matrix will eventually succeed too.