Are share-trading apps a safe way to play the markets?

After investors caused havoc on the markets last week in a battle over the shares of a video-game chain, we explore the promise and pitfalls of the apps they usedA year ago shares in struggling US video game store GameStop were worth just $3.25 a pop, yet at the end of last month they had reached $482. This stupendous surge was created by thousands of armchair traders, organising themselves on internet forums such as Reddit, who were attempting to outwit hedge funds who had placed massive bets o