I recall her saying that Zoom has 19 data centers worldwide and each data center was configured in a manner in which the highest conceivable demand on the data center was designed to be 50% of the data center’s capacity.
I saw her say that on Fox Business a couple weeks ago too. However, that 100% headroom they made for themselves is probably all gone since she said that. Every church, school and big family has signed up to use their free service.