Hi there.
Well, you can't really report them. I mean you can, but it won't help. Basically, you are trying to report a normal website with nofollow (read no spam) links, with some information (as long as it's not autogenerated, read not spammy content). So, what I'm trying to say is as long as that website doesn't perform any spammy actions like generated content, bunch of follow links and such, it wouldn't matter what the "real" purpose of the website is.
A non-spammy website, which functions, looks, being updated from time to time will not be considered spammy, just because it helps your competitors.
I hope this makes sense 

