no they filter many different ports and do deep packet inspection on anything that is not encrypted and will block if contains certain content. There is a set l

no they filter many different ports and do deep packet inspection on anything that is not encrypted and will block if contains certain content. There is a set list of banned words that will get content blocked instantly. VPN traffic is usually blocked once it is identified as being unlicensed vpn, you need a license to run a vpn server. So these vpn companies will rotate their ips multiple times per month and have special clients that keep the list updated just to avoid the GFW