TL:DR = They are looking at expanding, but it’s not on them. BAT is meant to use for services with Brave and not intended to be a currency. Any desire or use to have it on places like Uphold, Gemini, or other places is on the user.
I know, you saw it and downloaded, agreeing to terms without reading them. People are always good at doing that. Oh, other thing, might want to check out my big FAQ which explains a bit more about BAT and how it works. You can see it at PSA: User FAQ - Support & Answers
In particular, you may want to look at Where is my BAT from Brave Rewards kept? and What is BAT? (I actually need to move/copy over some things from Where is BAT kept over to what is BAT?)