We have been getting a lot of these in the prayer intentions forum- some you can tell are just spam, but there are always some that have a true need behind them.
The only prayer that I am aware of that is truly aided by publishing it and has a history of it is the novena to St. Jude. When I was in my teens and twenties, a Catholic in Name only, I made use of those novenas in times I felt I was in desperate need- and guess what? They were always answered…not always in the way I expected it, but I was always given a sense of inner peace. I would never discourage anyone from making that kind of novena, because during that period of my life, it was the only time I prayed fervently to God.
Some of the other novenas that need to be published I do not get- such as the one to Our Lady of Mount Carmel, which begins “O Beautiful Flower of Carmel, most fruitful vine, splendor of heaven…”
This is a legitimate prayer tied to the Brown Scapular. Where the notion of having to publish it in order for Our Lady to hear it comes from, I have no idea. Carmelite websites, aboutCatholicism.com, EWTN, etc all have this prayer on their websites and nary a word about publishing it. My grandmother used to pray this novena often as I was growing up.
But again, I would not discourage anyone from praying these novenas because it may be their only tenuous hold onto the faith.