It's certainly a possibility that a person who can edit in the category you've submitted to is one of your competitors. But remember that even if this was the case, if would be against our
editorial guidelines on conflicts of interest for such an edtior to give favourable treatment to his own site(s) by ignoring submissions from others. We are quite good at spotting abuse and dealing with it as appropriate. Also remember that no editor has control over any category -- as well as any editors named in the category itself, anyone named in a higher category can edit there, as can 200-ish so-called 'editall+' editors who are able to edit in any category they wish.
All in all, there is not much chance that this is the reason your site has not been listed. If, as you say, it meets our inclusion criteria, by far the most likely reason is that by pure randomness no-one's got around to reviewing the site yet. There are many suggestions from the public waiting to be reviewed, and public suggestions isn't the only way of finding new sites to add. On top of that adding new sites isn't the only editing task that needs to be done, and all editors are volenteers, editing in their free time.
As for reporting abuse, you'll need some firm evidence of an editor abusing their position, rather than just a "my site hasn't been listed yet" to get anywhere. I'm not sure that there is an "email address" for abuse reports, but there is a link to an online form on all the public pages. However, we're having some server problems at the moment, so it's likely that the reporting system won't be working for a few days.
BTW: What you've written suggests that you
may have suggested your site more than once. If this is the case, did you might like to read the
submission instructions more carefully before suggesting your site again...