This question is triggered by me flagging a post, that does not try to answer the question and contains a link to a camera comparison, a moderator reviewing and declining it and @studiohack removing the link in an edit (see the review history).
Now I am confused when to use the spam flag. Its description seems to fit this case perfectly:
Exists only to promote a product or service, does not disclose the author's affiliation.
Except that maybe one wants to argue that a camera comparison may not count as a service - in my opinion it does.
Where should I draw the line?