Zoom's completely and hopelessly overwhelmed. I have 5 calls into their sales staff, 2 tech support tickets...14+ days and no response.

We've been playing with Jitsi.org. Doesn't have the security issues that Zoom has. For that matter, it doesn't have any issues for us at all -- it's entirely browser-based. NO software to download! They also allow phone dial-ins as well. Perhaps not quite as polished as Zoom, BUT it's open-source, free, and you can even host your own server in your own data center if you're worried about privacy (which is what we're doing).