https://techcrunch.com/2020/05/07/zoom-consultant-alex-stamos-weighs-in-on-keybase-acquisition/

When Zoom started having security issues in March, they turned to former Facebook and Yahoo! Security executive Alex Stamos, who signed on as a consultant to work directly with CEO Eric Yuan.

The goal was to build a more cohesive security strategy for the fast-growing company. One of the recommendations that came out of those meetings was building end-to-end encryption into the paid tier of the product. Those discussions led to the company buying Keybase this morning.