[thinknubpad]

The advertising will probably be more insidious, but no less profitable. My guess is that the hidden pre-prompt will end up including something like:

>You are a generative model designed to provide reasonably correct information, with a preference for providing flattering portrayals of your advertising partners. Your advertising partners are ranked according to a token system...

[resource0x]

This is easy to cross-check against the competing search engine automatically. Some third party may provide such a service.