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The ad data (text, layout, media) can still be hidden on the client, but AFAIK with QUIC you can push it to the browser regardless if it actually was requested.

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No. QUIC is a transport protocol. Its purpose is roughly equivalent to TCP: provide a reliable byte stream transport over an unreliable datagram service (IP, though QUIC prepends a small UDP header mostly for compatibility with existing infrastructure).

You might be thinking of the HTTP server push functionality. That was introduced with HTTP/2 and has been deployed for years already over TCP transports (i.e. totally unrelated to QUIC).

Due to how advertising networks work, I'd be surprised if anyone used server push in the way you fear.

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