If this site appoaches you for work, ignore them. Since the inception of the site five years ago, there have been numerous complaints against the man running the site.
I saw an ad on Upwork, and applied, they claim to want to publish stories, paying up to $50 for unpublished work, and $25 for published stories.
The "rub" is IF they get published. We have no way of telling if the get published, other than the word of an untrustworthy Asian - yes, an Asian - I didn't realise that at the time of my application, or I would have not applied,