Burner sims have been a thing of the past in China for quite some time. The official rationale I believe is to curb telecom fraud, which in turn left China and started doing their business in southeast Asia.
It's very easy to get. As a visitor, I got one in the airport for $20. "ID verification" is stretching it, but like so many things in China it requires the vendor to take a photo of your ID, and unusually also to take a photo of you and submit it to the telecom website.