Well you can't reasonably opt-in or opt-out of a government, and you can't do much to change it if your saying you want a change lands you in jail for criminal speech. You can't freely associate to spread your message or convince others. If on the other hand, the government protects your speech from its own intervention, and you have a popular view that is unwelcome on some website like twitter, you're still able to freely associate with other sympathetic people, build an audience, and discuss your views elsewhere. The consequence in one scenario is jail and in the other is having to use or build Gab.