Why should Microsoft or Apple decide what software I can run on my device? I believe their argument is to allow them to retain a semblance of control on their

Why should Microsoft or Apple decide what software I can run on my device? I believe their argument is to allow them to retain a semblance of control on their respective platforms. Something about people always blaming the maker of their operating system for the glitches which may or may not actually be the OS's fault, and can tend to be the programmers fault. That's what they say anyways.