And it shouldn’t be just games, any time it says “buy,” that should be understood to mean complete ownership of that thing. That means:
DRM will be stripped in a reasonable time frame (say, 2-3 years)
for physical goods, no prevention of availability of parts
any server components will be made available for private hosting when the vendor is no longer interested in supporting it (ideally FOSS, but any source-available license should work)
And so on. If the product is intended to be available for a limited time, they should instead say “lease,” because that’s what that means.