The original outage wouldn't be circumvented by this however in this person's case they local Rogers resolvers or third party were probably just getting online so they were serving their local resources which is why the bigger entities were loading. So this just piggy backed into their DNS. That's was my thinking anyways.

I think you can get around this by installing VPN app (eg. dnscloak or 1.1.1.1)

Either install an app like the sibling comment suggested, or use one of these profiles: https://encrypted-dns.party/

Carrier-provided, not without third-party stuff, as others have explained. But the vast majority of users are on WiFi most of the time they are using their phones. When on WiFi, you can control the DNS quite easily.