My personal opinion is the fun I would get in solving a challenge rathen than winning a prize. However, you have a point there. At the same time, the sponsors are providing other prizes too. There are some participants who are still learning Go and attempting the challenge.
You can join the golang-challenge channel on slack which is a room for people who are going to participate in the Go Challenge - http://t.co/n6EesY9Mmv
No issue. You can include your full name and country of residence. We are accepting anonymous submissions but then these participants are not eligible for the prizes.