I don't get this.
First up, let me explain that, if you favourite one of my deviations, I will look, at the very least, at your Favourites to see if we share similar interests. If we do, then I'll check out your gallery and see what you're doing in that field. If I like it, I will follow you.
So once in a while, I'll get notification of a fav and go look at the relevant deviant's Favourites.
It immediately becomes clear that this deviant is watching new deviations go up, real time, and favouriting 99% of everything; because my deviation, posted no more than 30 minutes previously, is already way deep on page 6. Some of the stuff favourited before and since is good. Most of it is bilge. None of it shares any vague relevance, interest or theme. These deviants don't seem to be bots of any sort. Many of them are Core users (i.e. paying customers of dA) and most of them do have some degree of management of their Favourites and Galleries. So what they heck is going on? Are people using "Favourite" as a synonym for "Like" in some sort of gesture to give encouragement to everyone making a good effort?