Making a messaging service successful requires huge amounts of time and effort. If it's so decentralized that it cannot even be acquired, how could it get built

Making a messaging service successful requires huge amounts of time and effort. If it's so decentralized that it cannot even be acquired, how could it get built? To be clear, I don't doubt that the technical side is very feasible. It's the user acquisition side that seems improbable except as a commercial venture.