The app is tiny, it has changed very little in who knows how long. Infrastructure is obviously the big thing, so there would be a solid size infra team. Then standard business, product, marketing stuff. I just can't see that warranting more than 50 people unless it's raking it in. Sounds like they could be wasting money on marketing initiatives that may or may not be worth anything at all. Six full time writers seems pretty out there given the questionable ROI of those articles.
Obviously, take this with a huge a grain of salt as this is a guess based on being a frequent user of the app, and having done about 60 diligences and been a part of another 30 or 40 in review capacity. But it seems significantly oversized on what I normally see looking at business that have to be run sustainably. For whatever that's worth!
EDIT: someone had a good point that bandcamp takes international payments, which is complex. So I would revise my first WAG up based on that for sure. Thinking further I would probably guess 50-60 people - which is about what I guess it is after the layoffs. Still a total WAG, but slightly better informed...