I ran a pretty popular site that at its peak got a terabyte a day back a few years ago. One of the most common complaints I got was that cloudflare is unstable

I ran a pretty popular site that at its peak got a terabyte a day back a few years ago. One of the most common complaints I got was that cloudflare is unstable in China. The link you gave says serving Chinese traffic is at request, not for all sites.