Proprietary software is based on purposely hiding important information that affects the lives of people. I find this behavior appalling.

Copyright and patents on inventions are perfectly OK in my book. They are based on spreading the relevant information, not on hiding it. (However I loathe patents on theorems and algorithms.)

Proprietary software not only hides what it's doing from its user, DRM has all sorts of problems and could even damage your data/hardware, not to mention exfiltrate all sorts of information in the name of 'enforcing IP'.