First of all don't know why you're adding a h to the end of the sync tech. It's freesync and gsync...
Secondly I highly doubt the market is too small for gsync when nVidia currently have a much larger discrete GPU market share. If so then I'd hate to see what the uptake is on freesync monitors.
Because that's how it's usually spelled. I don't really care about the Americanised brand names.