Zoom I've always thought must have pretty strong security if configured correctly (obviously that's a big if) It is currentLy in use by the Chinese Academy of Sciences (CAS). CAS is sort of like a mix of NSF, NIH, and DARPA all rolled into one. About 20% of their research supports the People's Liberation Army (PLA) for things like encryption research, so I assume they know what they're doing.

This is technically a white label I guess you would say, but if you download the code, a majority of the files begin with the prefix Zoom and what not: https://cc.cstcloud.cn