EDIT: Sorry, I realize that I was speaking condescendingly here. I'm just trying to get the point across that asking us to actually solve the hard problem of platforms before unleashing them on the world shouldn't be too big a burden to bear. Some (myself included) would argue that our entire society is destabilizing because of the lack of ingenuity in solving this problem. It gets frustrating.
Free speech != the right to a platform, which is synonymous with saying that, just because you have a voice doesn't mean your message has immediate merit, or that it is the truth, or that people have to give your voice equal weight to others, or that people have to listen to you.
Restricting the messages a platform may carry according to the state's view of merit or truth, on the other hand, is exactly "regulating speech."
EDIT: To be clear, I am responding in the context of the upthread "Blocking WhatsApp would be a perfectly justifiable solution! Regulating it would be as well." Your argument seems less puzzling in the context of the very different assertion that Whatsapp itself should exercise editorial control. Apologies if this is what you meant.
If you're actually serious I'd love to hear your justification, but I feel like you just haven't thought about this very hard.