Bloggers can monetize any way they like. May not get to put something like adsense on wp.com but I don't want to do those anyway. If I am going to blog for product, any blogger does well to ask for two of an item, one to use in a recipe development, another to use in a drawing/giveaway. The benefit is not for extra cash, but using the drawing to pull in readers. Because to be honest, doing a post for $25 in product is insulting. I'd be interested in the traffic the post would produce. It is in the traffic that better paid posts come. Because they WILL want to know your stats as well as your social media info.
It is not a problem fr me to pitch the media and I am extremely interested in getting word that goes into print, or involves references in print media. It draws in readers who might not find my blog otherwise.
As for republishing material I own, I try to keep as much of the write up and photos as new and different as possible. And all my potential edits are updated, so if a recipe is on my blog, it is superior to any previous version. If people see a recipe of mine on say, food.com, if it is on P.Pastime. the one on the blog is newest and improved. So for updating, I don't necessarily republish anymore unless it has new photos and the recipe itself is newer and better. I have many any new recipes written for the blog I have't had time to post so those take priority over older material published elsewhere.