Artificial intelligence (AI) is expanding its use case throughout the economy at a rapid clip. The AI industry responsible for this expansion is something of a battleground, however, and it isn’t exactly clear which companies are going to end up as winners and losers over the long term.That makes it tough to know which stocks might be worth investing in to take advantage of the significant growth going on. Here’s why it may be worth thinking outside the box when it comes to AI and ETFs.