The world has left everything on the shelf in full public view and access for anyone to take. Everything is based on a system of trust where we willingly pay for things and take what's on the shelf, knowing full well that we could just take the thing off the shelf and walk away without paying. We all trust one another to be fair and do the right thing .... and for the most part, the majority of everyone agrees with that.
Unfortunately, some asshats decided that it was a good idea to make everything expensive or to nickel and dime everyone to death ... most people especially young people just get so pissed off because they can afford fewer and fewer things that they decide that the system of trust is no longer working or worth it.
So they just take the things off the shelf and tell the asshats to go fuck themselves.