The good thing about free markets is that you are free to choose to not use proprietary software. Unfortunately, there is some proprietary software that you hav

The good thing about free markets is that you are free to choose to not use proprietary software. Unfortunately, there is some proprietary software that you have to use to function normally in the modern society. Chat apps, as you mentioned, banking apps, etc. – precisely because the markets for such software are not free. That's not a problem with capitalism itself, but with insufficient regulation. The new regulation by the EU (Digital Markets Act) will hopefully eventually sort out the situation with chat apps and inspire more regulation to address similar problems. On the other hand, I can easily imagine a communist government requiring people to use certain proprietary software.