Who decides which comments are 'bad' enough to get you banned?
"They are a private company and can ban whoever they want"...
OK, and suddenly you find yourself banned for expressing an opinion which totally fits with your own ideology and which you thought was the epitome of virtue. You just forgot the company got bought and the new management follows a different ideology. Is the company still right in their decision to ban you? If not, why not?
Why does it matter if the company is right? What I wonder is what remedy all the people who complain about privately owned communication infrastructure are actually asking for? For instance, this site is moderated and you will be banned if you break the rules - would you make that illegal?
The main issue is that GitHub is used by OP's company as a work service.
There should be expectation that if a company is still trusting someone as an employee - then for WORK he should be allowed to use whatever business tools the company he's employed in has paid.
Imagine, if you will - a financial analyst getting banned from Bloomberg Terminal due to some issues in Bloomberg.com.
I find most aspects of social media silly, and combining it with a git repository especially so. But I still don't understand what it is that people want here - to use the government (as Libertarians would say, men with guns) to force Bloomberg to sell their services to that financial analyst?
Keep in mind that corporations are artificial legal constructs. If the government wants to put rules on companies with thousands of employees, that's very different from putting rules on people.
I said nothing about company policies. The issue of social media entitlement are orthogonal, and could easily rear their head if the dev you bad-mouthed in a comments ends up being your manager. Perhaps I'm just an old geezer, but I'm very careful to keep my business clean for anything that may touch me financially.
"They are a private company and can ban whoever they want"...
OK, and suddenly you find yourself banned for expressing an opinion which totally fits with your own ideology and which you thought was the epitome of virtue. You just forgot the company got bought and the new management follows a different ideology. Is the company still right in their decision to ban you? If not, why not?