What red flags you mean? Can you name all , please? Their team are real? I see, that on their site CEO "created QTUM" - is this true or no?
BitSE created QTUM and the founder/CEO of Fusion is the founder of BitSE. Patrick Dai is a founder/stakeholder in BitSE as well and he is the CEO of QTUM. Bloomberg even has a listing of the BitSE business entity and it mentions both DJ and Patrick (as well as Sunny Lu) as CEO's of BitSE.
You should really check the AMA link I just posted as that's one of the questions people ask him, you'll get the answers straight from the horses mouth.