https://twitter.com/LakewoodScoop/status/1247368774593937410Too many stories like this. Shiurim have been hijacked by Nazis and all kinds of highly objectionable content.
I'm not going to bother linking, ('cause I'm lazy) but Zoom has lied about some of its security measures, such as end to end encryption, and other things. If you need to have an interactive class, Zoom is useful and has great tools, but make sure it is password protected. If it's just a few of you, Whatsapp, Facetime, etc. are better. Try Google meetings for interactive video conferencing.
For streaming use Facebook, Youtube, Periscope or any of the other dozen programs and services there are out there.