I buy everything I can on GoG due to lack of DRM. If something is not on GoG, I buy from Epic simply because they pay a bigger share to developers than Steam. When I buy a game I want that money go to the devs, not middlemen.
GoG also integrates well with Epic, so I can have all my games there.
This is literally a huge pile of batteries that can charge at any rate at any time. It can soak the noon peak of solar, it can sip late night wind.