I was thinking the same thing. Traders already play games with amature's stop-loss orders, etc... This just looks like a tool that unsavy investors will get themselves taken to the cleaners by professional traders.
There are many people who trade the market based on charts. Because the charts are well known, traders know what the sell signal is for a specific security. So, they will sell that security below the trigger so that all the suckers ... um ... people using IFTTT for the stock market will automatically sell the security. This will tank the stock presenting the pro trade with a buying opportunity.
Can you elaborate?