"Freedom of speech" is the philosophy that no one can silence your thoughts or ideas (so long as those thoughts or ideas do not impinge upon the freedom of speech of others: "I think everyone should buy guns and shoot my neighbor Joe he's a child molester and a blood-sucking incubus" is not protected speech under American law). "Corporate responsibility" is the philosophy that a commercial endeavor should not act in opposition to the basic beliefs of its stakeholders (above and beyond profitability and value: Union Carbide might have helped their revenues through slack maintenance schedules, but they also killed two thousand people.) If the issue were freedom of speech, the rank-and-file activists of society would be yammering for indictments. The issue is corporate responsibility: no, there's no law against Reddit hosting nazis. But yes, hosting nazis is fucking terrible and hiding behind "well, but they're not breaking the law" only serves to encourage the creation of bad law.