Most other states will waive the pre-licensing requirements if you are already an agent in one state. Sometimes it depends on your state. They still want their ~$100 a year though.

Zenefits fell down there as well--they had many gaps in their producer licensing. They've now open sourced a compliance app to track this. https://www.zenefits.com/blog/zenefits-now-leader-licensing-...

(Most insurance agencies get by with a spreadsheet for this...)

They also list all their licenses here

https://www.zenefits.com/licenses/

It is a requirement of the State of California to be able to sell insurance in that state. It is independent of any federal regulation, or any other state's regulations.

Yes. But you can get licensed in every state in the US, but only do training in (for) one state. (Usually.)