Why do you think Taiwan reuniting with China would steal anything from the rest of the world? Nothing in Taiwan is owned by the rest of the world, Taiwan itself owns what they have. And the Chinese government will not stop selling what Taiwan produces.
Oh, I see, you're trying to excuse the Chinese for being arseholes now because someone else did something in the past. It's irrelevant because it's not in the interests of the rest of the world for Taiwan to be gobbled up.