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.
Someone at the end of those trades has to do the replacement, which will dictate second-hand car value.
BTW, batteries wear gradually, and a battery with 70% of capacity may be annoying for a car, but is still valuable for stationary energy storage (for solar). To me that’s another optimistic factor that can reduce actual replacement cost.