Thank you for getting back to me! You clarified a number of concerns I had regarding the token.
First, I need to apologize for saying that SGT was bogus. I went by the limited information I had as well as the limited activity I saw at Hive Engine and LeoDex.
So if I understand your reply correctly, SGT is a token for the Splinterlands players to earn away from the actual game when they visit the Discord server. It's like taking a vacation from actual game play while still having fun. It's also like a spin-off from the main game.
So SGT is for real, just not affiliated. DECR seems to be for real, but I'm awaiting confirmation. So this leaves Sun Protection Factor (SPF-- the Splinterlands Fan token) as the likely scam token.