[BrokenEnso]

"The notion that one has a right to collect data from users of a service is the same notion that says the service provider has ownership of that data."

Last year my family went to have a family portrait taken by a professional (service provider or portraits) photographer. The photos (data) that were produced from the photo shoot belonged to the photographer. That photographer was more than happen to sell me family portrait, but the law is fairly clear that he in fact owns the data (all photos that were taken), i.e. he has copyright over the data.

[dublinben]

The law isn't actually clear at all. Commissioned works (such as a private portrait session) can very often be considered "works for hire," depending on the exact wording of the contract.