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by londons_explore 3455 days ago
Ad networks generally won't let you do that. To them it looks like click fraud.

Also, most ads are now html5 with many resources and scripts etc. for interactivity. You can't just host it on another domain - there will likley be lots of internal absolute paths and paths assembled with JavaScript that one can't practically rewrite.

Remember most sites use an ad-exchange, so we aren't talking fixing up one or two ads here - there are probably over 1 billion unique creatives to fix up.