The ultimate goal of this wiki is to increase the amount of people using it.
Otherwise, it's of no use and nobody will use it.
However, at least one person will have a use for it (ad spaces and links) so this is why it was created.
Everything else is up to the individual editing it, see rules for details.
Deleting anything is good as long as long as a new category couldn't be created. Links anywhere are a good thing. Anything can be changed by anyone else as long as one creates a good page that is helpful to someone else.