I have seen multiple small companies that contribute to the CNCF demand their employees sign noncompete agreements like this.
Even working a retail job would violate this agreement, as that is a market their competitors are in (despite it having no relation to cloud tooling!)
Our little sub-$1million startup was selling devices that competed with devices from a bunch of mega players like Dell, IBM and Amazon. Who's left to work for if you can't work for anyone who competes with Amazon?