I'm in China right know with a Mainland/Macao/HK eSIM. My Chinese friend has to use a VPN to access Instagram as did I when I was connected via WiFi in mainland China. Using the eSIM connection I could access Instagram and Youtube without any issues, likewise here in Hongkong (with WiFi).

I didn't investigate how large the difference is, but Hongkong traffic is still treated more liberal.

It was really sad seeing all the bookstores close.