Oh, um. I have, sometimes. It depends on what I’m trying to access, some sites have extremely strong measures where they’ll block known VPN IPs and even check for things like the right timezone, and the fact that Opera’s VPN is so public and shared means it would never work for those sites, but Youtube is pretty lenient? It’s usually worked for them.
Most geoblocked Youtube videos use the approach where they’ll restrict the countries where that media already has other copyright holders, e.g., Juliantina vids in the US were blocked because Univision had rights. But if you found a country that didn’t have anything like that, it was most likely fine. And because in Juliantina’s case, there were even some European countries that aired it, I’d usually pick Asia and be able to see them no problem.