I think the trouble with MVP is if you look at early days of Twitter for example (both its UI and the frequent 'fail whale' outages), it wouldn't pass muster today but at the time was enough to become one of the main platforms of the web. Nowadays, you'd need a much more polished MVP in order to compete because the standard of what end-users expect has risen a lot (both in terms of functionality & NFRs, like security, robustness, interop, etc.).