Additionally, I have yet to encounter any example of reasonable discourse that's being legally suppressed by hate speech laws, but, you know, feel free to make a list of the important ideas that you feel are being SILENCED.
Private companies: not that different in the fundamentals, but there are additional issues that lean towards both the right of ownership to speak and restrict speech that comes through them. You likely wouldn't want anyone to force you to repeat ideas you believe are incorrect, or contrary to key personal interests even where narrowly correct, or even lead to effects you find personally undesirable. If freedom of speech means anything, it has to include some measure of judgment about what your personal faculties are used to express, and to some more moderated extent what/how your property is used. There may be balancing concerns in the latter case, but whether we're at that point is another issue. Again, I can think of very little in the realm of valuable discourse that's been walled off here; if there's anything at all, I suspect the relevant mechanism is essentially social values that are held widely enough that contrary expressions bring social consequences, and while you can create some spaces for robust contrary discussion ("safe spaces", if you like), you can't eliminate the kickback from broad social consequences without treading more heavily on other liberties of equal or greater importance to speech.
Honestly, if there's any issue at all here, it's that there has never been an EASIER time to express ideas -- even very unpopular ones -- quite widely, and it's the way that these ideas carry widely that's leading to a level of tension that people are still figuring out how to manage.
And really, this is the weaponization issues: 50 years ago, authoritarian countries didn't have the capabilities of broadcasting ideas or disinformation into your average household, much less an individual handheld device. A world-of-ends internet means that they do.