Except you yourself pointed to how corporate censorship and social pressure were used to stifle the free expression of LBGTQ people for ages. I would say the power that corporations are able to wield over what people say is very much a speech issue (obviously cooperate power goes beyond speech issues into other areas though). If you work for a company and they are able to control what you can say outside the workplace: that is a speech issue. I am not a lawyer, I know I am not going to win a debate with you on this. But in my bones, I know corporations can use their power to stifle free expression
sigh Just think this through. Who would be the entity that made corporations (and people!) provide the speech?
The government. Do you see the problem? So, again, if corporations are too powerful, that's not a speech issue.
(As for my earlier comment I made sure to note that the government suppressed the speech as well, and my point, which you didn't seem to engage with, is that there is more speech, on more platforms, allowing more people to speak than ever. Which, given the comment section of a lot of places and social media ... not an unalloyed blessing. But I will reiterate that while I am concerned about the principle of free speech, the actuality of free speech is greater today than ever.)