I hold quite a few controversial opinions, and in the last year or two I increasingly feel unsafe when expressing them on the internet. I do not fear governments, but I do fear witch hunts, and I fear automatic indexing/flagging of my speech by corporations. The recent doxxing scandals are not helping my peace of mind, and neither do the firings of people who get "exposed".
The original version of "freedom of speech" only said that the government should not persecute people for speech. That was certainly a great idea, when the government was the only entity that could realistically persecute you. Today we additionally have huge corporations and online hiveminds that can and will punish you for what you say. Other "human rights" that have sprung up in the last century acknowledge the new reality, e.g. people get protected from discrimination by private companies, not just by the government. Freedom of speech is lagging behind: a company cannot fire you for being black, but can fire you for your online conversations outside of work.