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http://www.ietf.org/rfc/rfc4303.txt

http://www.ietf.org/rfc/rfc4347.txt

It's possible: DTLS. Also CISCO uses UDP for their VPN solutions so go figure.

Not Invented Here.

Google wants control, IMO.

I'd be interested in their reasons for not using DTLS, or improving DTLS. They actually use it for WebRTC.

come to think of it OpenVPN uses UDP also, and that's considered quite secure. So what kind of encryption are they using? Rolling their own sounds scary.