Yes, it's almost like a fairy tale where children are offered candy but then very bad things happen. Hansel und Gretel, etc. We should have known all along!

Continuing with your Hansel and Gretel metaphor, the first time the candy turned sour for me was Goog-411. It was a service (at least over here in the US) that allowed you to look up local businesses via voice prompts over a phone call. When the service was still active, calling 411 via a mobile phone had a per-call cost, so a free lookup service seemed great.

I found out later that Goog411 was created to primarily train on the voice prompts from the users of the service. Left a really bad taste.