The trust factor is something that cannot be checked at first, but by giving them some sort of custom information for each and every article to submit could be a way of finding trusted one. Like insert this particular like for this website, so they cannot submit bulk article on all websites.
I do not see any negative effect of nofollow links and this is good for getting traffic and making do-follow links natural by mixing some nofollow link in your website backlink profile.
Offpage method for bing, yahoo, and google are same. You should not think differently they work on the same signal, but only the difference is that some is tough and other is easy.
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