And then what? You want to put up a website that only resolves from said alternative DNS server, so you… tell everyone who may want to visit your site that they have to first setup a different DNS server?
Examples:
• if a site is banned from ICANN DNS, then there is no other choice,
• if I want to keep bots, spammers, search systems, providers, and government out of the door,
• if I want to welcome technical elite but hide from everybody else, like it was in old Internet.
• if I don't want to pay X$ every year for every domain.
• if I want to have a cool name for my site.
• if I want to create overlays for popular sites, to fight ads, spam, promotions, PR, and unwanted content.