> gamers should own the games they buy

Agree with the sentiment, but almost every digital purchase nowadays does not tie with ownership, but a license to use whatever you pay for - and it can be nullified at any point in time. If Steam were to go bankrupt tomorrow (unlikely, but for the sake of the argument let's imagine it), you would probably lose complete access to your library of games you "bought".

One exception may be GOG with its DRM-free policy, but it's a very small part of the online reselling market.