The game doesn't resemble GT in any way, shape, or form. GT is, I suppose, apart of the Dragon Ball universe, but what do you expect to see from the series? Some look-alike Omega Shenron NPC enemies? I don't see how you can work GT into a DragonBall MMO; drawing styles? Enemies? It's practically the same as Dragon Ball Z, it just lacked the originality, and made the sagas seem more boring: New enemy approaches; Gohan, Trunks, Goten & Pan fall to the enemy - Vegeta declares himself the Earth's saviour - Vegeta loses - Goku arrives - Goku wins - Vegeta loses - Goku wins - Vegeta loses - Goku goes SS4 - Vegeta loses - Goku loses - Vegeta goes SS4 - Vegeta loses - Goku goes SS6, and so on so forth. The series lacked, instead of aiming in another direction with the characters and story, they just continued down a path Dragon Ball Z was inevitably going to reach. What do you like? More transformations? The exaggerated powerlevels? I've been wondering for awhile why people [Ravendust] your age like Dragon Ball GT. I was always under the impression the kids enjoyed GT, because everything was focused so much more on Goku, and because it revolved around new Super Saiyan levels so much.
GT wasn't a success; DragonBall and Z were. Toriyama wouldn't add anything related to GT unless he found it necessary; DB/Z = Skill, personas, character development, etc. DBGT = All fighting, new transformations, boring, etc. No matter which way you slice it, DB/Z is genuine, and GT is basically just an expansion, that added some extra Super Saiyan levels & at the same time destroyed characters - it revived dead villains & concepts, because of lack of ideas........ perhaps not destroying what was great, but exaggerating it. So, in turn, we look at it as 'Non-Canon', "Not Canonical", "Not Real"--whatever you want to call it. Toriyama gave it his "seal of approval" possibly because he wanted some extra money. Money can do wonders... especially when you have a family to take care of. Who'd really pass up the opportunity to be more famous and rich? He may have wanted to stop the DragonBall manga, but ... what the hell? Money = Yes to practically anything.
They said DBO is set a couple hundred years after Z, meaning GT is not involved here. This is a relief for me. I think the Dragon Ball GT look would ruin everything.