I’ve used isnare.com in the past. They have a distribution program where they will ‘blast’ to publishers in ‘your category’.
The service is only $10 to distribute 5 articles and they let you know who received them and the publisher lets you know when published.
They accept gambling articles and of course, you get a byline and link back.
Over the years, I have had nearly 10 articles published and never been turned down once. It was gratifying in that on several of them, I got a 5 star rating–an extra bonus.
One complaint, a publisher added the ‘kontera’ advertising link to my article and even in my byline! but I contacted him and he removed it.
PM me if you need additional info.