That's the whole point of Gmail's Contextual Gadgets. For example, we created a gadget that's tied to our homegrown Helpdesk system so recipients of tickets can manipulate them directly within email rather than logging into the Helpdesk app.

It wouldn't surprise me if Google nudged Rapportive in the direction of contextual gadgets for this reason, but since GAPE domains already allow disabling of ads it isn't like Rapportive is causing Google any pain & suffering. On the consumer side, like others have said, it's all client side so besides having to deal with Gmail's funkalicious obfuscated js I don't risk see much risk.