I already buy content like this on D&D Beyond. It doesn't feel predatory to me, quite the opposite. I don't want most of WotC's big adventure books, especially not for $30 on Amazon for the use of one monster.
If I use their VTT (I currently use no VTT and am ambivalent at best about ever using one), buying miniatures and scenery a la carte is how I'd prefer to do it, rather than paying $30 for a bunch of, say, lost world miniatures that I only want to use a pterosaur from, for an aerial cavalry in a non-lost world setting.