I think the author is noting that, as with Dropbox, video conferencing isn't new (Skype has it), it's just then when the chips were down and millions of people

I think the author is noting that, as with Dropbox, video conferencing isn't new (Skype has it), it's just then when the chips were down and millions of people needed it Zoom seems to have worked better for more people than more established entries, and part of this is probably that some fiddly things are done well in Zoom. I'm making no comment personally about Zoom or its ethics, just trying to clarify how I see the post.