I wrote:
#4 ("You cannot actually change anything in
Wikipedia") is weird.
I see what you're trying to say, but the surface implications
seem misleading. (I've taken a stab at editing it.)
But my edit got reverted, so I submit it here for consideration:
No one can actually make a permanent change to Wikipedia.
Anyone can edit Wikipedia, but what that does is to
create a new copy of an article, which is then implicitly
chosen to be the one shown to all readers by default.