There are no Tizen devices around and whole project seems to be more like Samsung's leverage on Google. They make absolutely no money with Tizen.

We'll see how they make in the long run. For example, Red Hat actually withdrew from consumer market because there were no business potential. Ubuntu on consumer side doesn't profit either.

Cut off Google funding it and you have no Android. Cut off funding from Jolla and you have no Sailfish OS. Difference is that Google has many other sources of income, for Jolla Sailfish OS is the core business, so if it was completely open sourced, where would that business be? If there is no answer to that question, there's no much reason to actually demand for such thing - there has to be profit somehow or there will be nothing in the long run. But of course, if you truly believe that Android is much better choice Open Source wise, then by all means go that route - as long as it is there.