All these depend on the data from authoritative website such as Yahoo whatever the data wrong or right.Set up the rule,no one will complain even sometimes the data is wrong.
You might think that, but you can't make it 100% sure that those result streams from those websites can't be manipulated.
If these functonalities get implemented, where it isn't 100% tamper proof, I will sell all my CHA.
not 100% but 99%. Or to put it differently, it would be so expensive and difficult to do that it would only make sense if the market cap of CHA is 10 billion US, but then the developer can still change the data source when that happens