Study: Android is least open of open source mobile platforms (arstechnica.com)

Considering that there are pretty much no other open source mobile platforms, that is trivially true.

I think Android should be even "slightly" more closed. Extreme openess doesn't work for consumer products, as Linux has proven before it. I wouldn't want Android to become another Linux in the mobile world. I'm not saying Linux hasn't done wonders since it existed, but it did mostly for technology companies. It's been a failure in the consumer market, and that's because of its "too" open model. Openess is a scale, it's not an either/or thing.

There is only one other Mobile OS in the study, and that is Symbian considered before it was closed again...