This choice is just in theory. Like Cory Doctorow said, you and your close friend circle cannot agree where to eat launch today, how the heck are you going to agree on which chat app to switch to?
I got my choice and deleted Facebook, no looking back, but guess what? I missed A LOT of information from my collage including many meetings.
With this law, people would no longer need to bother any of their friends to install anything, they could start switching one by one to what they like.