They're planning on rolling out the system nation-wide in 2020 and making it obligatory, and nobody knows how exactly that system will look like.

However, there's over a dozen of local projects already in place, whose participation is voluntary (Honest Shanghai[0] is one of them). Offer a couple of gift cards and cheaper rental cars and there's your test group.

It is a commonly-accepted opinion in China that if you commit a crime in a city X, you shouldn't be able to go to city Y and repeat the same crime. Limiting the movement of "criminals" is how you achieve that goal. There are other techniques as well, like naming-and-shaming "offenders" on public billboards in their neighborhoods.

[0] Some screenshots and a bit of details available here: https://www.sixthtone.com/news/1554/new-app-rates-shanghai-c...