From Zoom's May 1 newsletter

Zoom has seen tremendous growth and new use cases emerge over the past few weeks, and we are committed to ensuring that the safety, privacy, and security of our platform is worthy of the trust of all of our users — both new and existing.

That bolded part reads as if there has continued to be tremendous growth even after the April 19th announcement of 300 million daily participants, but I may be reading too much into it.