How is Tizen different then Android from a privacy/OS perspective? What will stop Samsung from closing it off when it gets too popular? (And, BTW, it's not lik

How is Tizen different then Android from a privacy/OS perspective? What will stop Samsung from closing it off when it gets too popular? (And, BTW, it's not like Samsung hardware is the pinnacle of OS design. Exynos is notorious for being hard to make custom ROMs)