I played KOTOR on a fire tablet back when they had the Amazon Underground app store and it worked alright, after underground the only apps that worked worth anything were the amazon bundle of shop/kindle/Alexa/etc.
My last one I gave to a friend (she uses it exclusively as a kindle) after Amazon ended watch party on video and I ended my subscription.
I believe there are apps that solve that issue, I think it was Voyager you can have multiple accounts logged in for a unified feed.