The main problem with zoom seems to be that it was released with default "promiscuous" settings, i.e. very easy to use and very vulnerable to unwanted "guests". The oldsters who I know think it is the greatest thing since sliced bread, but I told them to dump it, or else set it to "Hosted Chat" mode by the first one starting a chat, admission of guests needs to be approved, based on recognizing who is asking to enter a chat, etc. Supposedly it's less vulnerable when you do that. Personally I use wire for the tiny bit of chatting that I do.