Indeed, the idea of ownership is a basic natural concept that lawyers are trying to erase with newspeak and nonsensical hidden terms. It's a concept that's been unchanged for millions of years, even before humans existed. If you disagree with me, try taking a bone away from a dog chewing on it. It even goes back to single-cell organisms: even the mitochondrium is just [a cell owned by another cell](https://en.wikipedia.org/wiki/Symbiogenesis).

And can you sell it afterwards?

The gaming industry is not ready for that discussion yet, but you absolutely should be able to.

It's being discussed in courts, see e.g. https://www.eurogamer.net/french-court-rules-steam-users-hav....

You should be able to if it is being advertised as “buy”. They should just say gain access to use it or something like that if they are not really selling anything.

If you're in the EU, you can :

https://www.clarionsolicitors.com/articles/reselling-used-so...

It might be difficult in practice though, with platforms like Steam providing no means to actually resell a game to someone else.

case in point amazon kindle and "buy"