I wanted to use dns over https in opera browser so that I could block ads which opera's dumb adblocker does not block.
Every custom DoH address is rejected by opera (I've tried adguard, nextdns, control d and many more.) but cloudflare and Google doh work flawlessly. Why? Just because they are built in?
No custom link working shows that problem is at opera browser, not the network.
@leocg can you give explanation of this weird behavior?

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