That person created NFC tags that can be scanned to automatically start a game when the tag is scanned.
The tag is added to a physical small box, cartridge-sized
Regarding ownership of the games files, they made a point about it at some point in the video, saying that they now only buy games from GoG to be able to just store the .exe files, DRM-free.
Yeah I am the same. Haven’t bought a physical game in like 15 years, and even then it was inadvertently - I got a copy of FIFA for free when I bought a PS4.
I understand the potential dangers of buying something and not actually owning it, but the convenience of having a sortable digital library is just overwhelming. And even stuff like saving records of what you’ve played to your account has some advantages for stuff like game recommendation algorithms.
Plus, there is a good chance I die before Steam does anyway.