They might not be as wealthy or powerful as other religious sects, but them being a cult is still of concern because by nature they are 1) secretive and non-transparent, 2) capable of fierce organizational discipline including taking advantage of members, 3) operate via proselytizing including underhanded means, 4) open to extremist and authoritarian beliefs. That's in the very nature of cults. Add that to their historically-potent political influence from the Cold War, and they're still worthy of investigation.