It would be interesting to create some sort of crowdsourced database for these types of anecdotes that could then be sifted through and corroborated. Something like that might bring a bit more transparency to the "deal" we all make with these types of services. I get the whole argument of "well you wanted to use the free service, so now they get to monetize your data", but what services collect and how the data is used is extremely opaque.