Wow, read the original article about it, which you've also mentioned here, and I am pro not using company's platforms for personal opinions. Although I think that I've been lucky enough to have had work environments, where I was able to freely state my opinion. Of course not the whole day and not with everyone, but is wasn't banned.
I do know that some people, especially those government employees, or those who work for businesses that get a lot of work from the government, can't freely state their opinions.