They were doing the bare minimum at first. PTA would order the ISPs to censor resources which would implement the block alone and that's it. Easy to bypass with HTTPS, a 3rd party DNS server, or a VPN. They've since bought an $18.5m web monitoring system from Sandvine and centralized the censorship under PTA. The companies don't deal with it anymore: https://www.codastory.com/authoritarian-tech/surveillance/pa...