Why @CitizenX is uniquely positioned to allow countries to compete for citizens:

With CitizenX, once you get onboard, you have the market of countries at your fingertips.

This not only allows you, as a citizen, to reinvest in the same or other countries – but also creates an incentive for countries to compete for you.

For example, El Salvador could rely on Malta's due diligence process to streamline future applications

And easily target a network of sovereign individuals who are pre-vetted and have demonstrated skin in the game, putting their capital where their mouth is.

The problem with solutions/platforms focused on a single jurisdiction is that there's no interoperability. 

You get one citizenship, and the next time you want to get a residency/company/passport, you have to start from scratch.