All internet traffic is already monitored since 2010-2012. Whatever traffic that goes out of country is monitored. There are filters installed where the whole traffic gets mirrored and is then monitored.
Banning vpn is one thing and stopping people from using it is other. There are many ways one can still use vpn....there are is one decentralized vpn which u can run on ur Internet connection and u earn crypto for it.
I ran it for a month and heck a lot of people use it....my 1 day of data usage on it was 100gb with 100mbps speed alotted to it.