Yes, online slots have created quite a few millionaires over the years. Some games can have progressive jackpots worth millions of dollars and it only takes one lucky spin to win the entire amount. We saw this happen in land-based casinos and in online casinos right here in the US.
If you scroll down to the bottom of the page, you will see several logos from security companies which have verified the online casino. More than that, it has licenses in the UK, in Malta and in Alderney and is a well-established brand known around the world. In short, yes, NetBet Casino is legit.