I think what you mean is cracked software or software that you have
to pay for. The difference is that you get technical support and upgrades
with paid software. You do not have those advantages with cracked
software. Also, nowadays, most cracked software comes with a little
"surprise" - like a virus, trojan, or even a keylogger that steals your
passwords, etc.
It's not as much fun as it used to be . . . I should know
"Wiz"
Lots of them don't work good. You end up spending an hour or two trying to learn it and finally figure out that essential features are disabled or don't work properly because they hadn't figured out how to crack that particular part of the software.
If they work for you, great. If they don't though, just remember you would probably have a better experience using the real thing.