I had just spent a week down in Melbourne for Games Connect Asia Pacific where I had met up again with an friend from university who made krunker.io - he told me he was getting millions of players and he also told me how he did it. I was then inspired to do the same.
I was going to make an .io game.
On the flight back I was brainstorming with my friend and he suggested doing something like trackmania where the networking is a playback system. I liked this because it sounded easier than conventional game networking I had done in the past. After a bit more brainstorming we landed on minigolf - probably because we had played it the night before.
So minigolf + trackmania and off we went registering the domain golfroyale.io