That's an excellent question. In my experience, most people just buy ready-to-fly whoops, and because they only contain a few components - sometimes just a camera, an AIO, and motors - there isn’t much you can modify or upgrade. I’d be interested to hear your ideas on how the builder tool could be applied to whoops (and in general).
@ilkanarGood point! If you've already built a whoop, I'm sure the community would be thrilled to see your creation - maybe you could even share some tips!