I was browsing YouTube and I came across this video In the video they show how to crack the password of a wifi using CommView, Aircrack and Wordlist.
According to the video it takes about two minutes to crack the password, but I guess it can take a longer time, depending on the difficulty of the password. But what is the downside of this method? I mean, if it is so easy to crack a wifi password, why do wifi which requires payment exist, for example on an airport?
Is the likehood of getting caught 100 percent? Or was the person in the video cracking an "easy" wifi?
And to the main question, how does one protect oneself from an attack like this?