Fifteen years ago I was counseling clients to register their "Web names" on each top level domain as it became available, e.g., .com, .net, .biz, .info, etc. The resulting confusion can create problems quickly.
A good reputation takes years to earn and only a minute to lose.
Probably ought to avoid trying to register at .mil, though.
That's still good advice. The vast majority of Web users don't understand the domain naming system or URL construction. It's a whole lot easier if we don't ask them to.
In addition to consumers, those of us with Web businesses can take this as an opportunity to learn.
And best of luck to those who were fooled. I hope there's some recompense.