So, entice the visitors to become your guinea pigs and make sure it works before you start forcing the rest of your populace to use it? Sounds about right.

Because, let's be honest, once this thing is fully up and running, people in China probably won't have much choice in the matter for long. It'll start with 'nudge theory', but will swiftly become outright coercion.
sounds familiar.. i wonder why you ever thought up that those interested in new payment systems use coercion to try getting people to use the new project before its really ready to work for all use cases(it is being falsely advertised to achieve)...
you know. coercion, like trying to limit utility growth of a legacy currency system just to promote a 'nextgen' thing as a solution to legacy system implimented limitations, using people as guineapigs with coercion techniques.. bribe them with cheap fee's make promises of its success rates that dont materialise
but yea, probably best to make sure the thing works flawlessly first in all circumstances and not only in utopian best use-case scenarios, before promoting the hell out of it and calling it a replacement for a legacy currency system