I can't tell whether you're joking, wilfully misinterpreting the GP, or something else.
The past few years have highlighted some of the suboptimal machinations of our society, like collusion between government and media to silence domain experts who don't agree with a dominant political narrative[1].
The ethos of the internet is that it's a place where you can say whatever you want--the corollary is that I should be able to read whatever I want if it's being said. The relationship between me and people speaking is being manipulated, so, in that sense the ethos of free speech and the internet is broken.
The conclusion is that, no, in fact, you can't say whatever you want online. Saying that you can't guarantee an audience (without more context) makes your statement seem pejorative, as though the speaker feels entitled to an audience. The GP alludes to the free exchange of ideas, which your statement seems to ignore.