Tencent is a successful company with revenues, products, and services that are easily verified independently. They've gradually expanded by delivering on their transparent mission statements and acting in good faith with Chinese and American markets.
They didn't have to acquire a non-reporting dirty American shell to raise American capital.
FINRA approval doesn't mean legitimacy. It simply means that insufficient reason was found to deny a corporate action.
As I've stated repeatedly, FINRA has approved corporate actions for entities that have proven to be scams later on. There wasn't sufficient grounds to deny those actions at that time.
I'm sorry that isn't what you want to hear, but it's REALITY.