It's almost like there was a unmissable event that occurred that both companies responded to.

That’s a very charitable interpretation. Too charitable if you asked me. Much more likely that everyone saw Facebook ban Trump then piled on after them, no longer afraid of the blow back. Still not collusion though.

Except I don't think they all would have piled on if not for that unmissable event

Fair. Both things happening were likely necessary.

The world is not divided into collusion and coincidence.

If I’m standing near someone and a bomb goes off on one side of us and we both run away in the same direction, there is no coordination, collusion, or common endeavor needed to motivate that similar action.

It’s also not at all “coincidence”.

Turns out trying to overthrow the government is quite the coincidence