Okay;
Stop whatever you're thinking UWA is - you have it wrong. Just... trust me, put it out of your head. It's not that.
Think of a UWA as a password protected .zip file.
It has a program in it, but its password protected, so nobody except the maker can alter it in any way.
Except you can't just make that zipfile with a third party program, you have to use a microsoft program to do it. And anyone who isn't Microsoft, when you try and open that zipfile you get a big "DANGER WILL ROBINSON DANGER!" warning.
So one of the problems people have with that, is that if you are not MS you cannot make or distribute programs in a manner that does not make you seem like a sleazy hacking group trying to steal peoples jiggahertz.
But at the end of the day, its a zipfile. It doesn't phone home. It doesn't access your accounts. It doesn't make the programs in it smarter harder faster better.