Why does Opera's built-in ad blocker let ads through?

Many Opera browser users are disappointed to find that its native ad blocker lets through video ads on popular portals or specific sponsored banners on search engines.

Limitations of commercial allowlisting

Built-in blockers often participate in corporate deals to allow 'acceptable' ads. AdBlock Network is completely independent. The extension performs asynchronous read-only requests to multiple independent endpoints to update its firewall, ensuring that blocking at the Address layer makes no commercial compromises.