ROFL
Not necessarily, that's an exceedingly limited viewpoint of all the various uses of jailbreaking a phone. It's just putting a custom operating system on it, and/or doing other tweaks. While yes, it can aid in pirating software, it can also do wonderful things like removing all the bloatware the cell phone companies and their paid affiliates fill half your phone's memory with, improving performance, allowing you to customize the UI more then you usually could, etc. You usually don't need to jailbreak them to play pirated games anyway.
In some cases, you can jailbreak Apple devices to allow them to do things they should rightfully already be able to do, or make features they're putting behind a ridiculous paywall free- my husband had the first Iphone when it came out (Only because it was really the first smart phone out there, at least widely available here, and he loves tech) and he had to jailbreak the thing to let him put a custom text tone on it. I don't know if it's still that way, but later devices apparently kept you from putting a custom ringtone unless it was bought through Apple's store- as if custom ringtones hadn't been available for free on essentially every phone for years before that. Both my old flip Razer's could do that.
Anyway, not my current phone no. We have the Galaxy Note 3s, and my husband's jailbroken his, but it's causing some issues with it. I wanted to do it to mine to get all the BS Samsung/ESPN/T-Mobile crap off of mine, free up the space it's using (though I don't really need it with the huge memory card in it) and get that crap to stop wasting my battery by updating and being annoying by it's existence and whatnot- but we haven't had much luck in finding a break that can remove that stuff without breaking the phone. They worm it all through all the inner workings, then the phone just doesn't work right when it's gone... The only reason I've ever opened most of the 'included' apps any of my phones is by accident; there's just better apps you can download in most cases.
I forget what our last phones were, but from the around the middle of the time we had them to when we upgraded we had them jailbroken with custom operating systems on them. The phones were older since we had them so long, and the custom OS ran better on them then the official, and successfully got rid of the bloatware that was on them too, making them a lot faster. Plus, there was some neat UI stuff we could do with them jailbroken if I recall... that was like two years ago though.