I think they can compete in all of these areas, at least in theory. Scalability has been done before with things like email and old school messenger programs, U

I think they can compete in all of these areas, at least in theory. Scalability has been done before with things like email and old school messenger programs, UX design doesn't really rely on a system being centralised or not, and monetisation/incentives are much the same. Unfortunately, the issues often arise from philosophical disagreements and business logic rather than anything technical. Companies tend not to invest in decentralised systems, because it's probably easier to make money if you control the whole system rather than contributing work to something used by thousands of providers. So it often falls to the open source community to develop these systems, and well... that community often doesn't prioritise UX design all that much, nor features designed to make money/provide incentives for popular creators on them. So the developers are often 'design peaked in the 90s goddamnit!' types, and the users are often against the idea of either mass appeal or the system being used for business purposes/monetised.