@am-nasty mario games said in Opera blocks pages?:

Ok, but this only happens in Opera. When I search for the same page on Google for example this doesn't appear.
I've also just changed my DNS following this tutorial (Windows 11).

I have the same situation as you, I don't know how to fix it either. Maybe it's because I have installed some protection on it. I have tried accessing on other devices and can still access those pages normally. You can also try logging in with another device