One of the biggest you tubers recently got outed following a white supremiscit rant - and that is one of the bigger "smells" around the community - histories of "what if the Nazis won and what if the South won US civil war" can spring not from curiosity but yearning.
I personally enjoy WhatIfAltHist as a channel, partly because he is fairly front and centre about his own political (rather centrist and boring) (small p) views.
The big takeaway I have found is that I learn something interesting about our real timeline history and about our real geopolitics - how England supported the creation of Portugal through the middle ages, or the extent Tamerlane changed Europe by killing everyone. And just how contingent the world is.
So yeah it's a fascinating area, tread carefully, I have only dipped my toes in, but it can be very eye opening.