That’s what buggs me about the situation. Physical media doesn’t matter one bit.
There’s nothing about physical media that conferrs any kind of ownership over the copy. Already way back in 2012 I bought an used copy of Skyrim only to find out when trying to install it that it used Steam and the CD key was already tied to the previous owner’s Steam account. I had the physical media, but it was worthless to me.
What we should be fighting (or put our money towards) is DRM-free copies, like what GOG sells. If you really fetishize plastic disks nobody’s stopping you from burning a copy of the DRM-free installer onto one, or you can put it on your NAS, the cloud or where the sun don’t shine.
Not really. Games have very similar security implications as any other server/client software.
You are right now reading on exactly such a system, which is open source, and still you don’t see massive amounts of hacks targeting lemmy or piefed.
The premise is simple: Never trust the client. The border you have to defend isn’t the border between the client software and the user, but the one between the client and the server. Always treat the client software as compromised.
In terms of games that means: