You are correct. He used a VPN for several US locations in the video. He then compared what content was shown in different regions of the US to see if everyone sees the same thing or if the content is radically different depending on where you are.
I’ve read through your various comments, and I’m not sure you see the difference here.
With other platforms such as Steam, you download the Steam program that acts as a single installer for every game on the platform. You have to be logged into a valid Steam account to download a game from their single installer. If you use a new computer, you have to log into Steam and download from Steam. On GoG, you download an installer per game. Those installers can be transferred to any device and download the games even if the computer has never logged into GoG or even connected to the internet. You can store all the installers on an external drive, which you can’t do for Steam.
If Steam eventually dies or your account is banned, you can never install those games again. If GoG eventually dies or your account is banned, you are correct that you can’t download new installers, but you can use any installer you have already downloaded.
If Steam dies or your account is banned, the game you already have downloaded may not even work anymore due to DRM (this is on a game-by-game basis). If GoG dies or your account is banned, your games are guaranteed to still run since they are not dependant on GoG DRM (with a small list of exceptions people aren’t happy about).
You may not care about any of this, but there’s a decent chunk of people who want to keep their games regardless of anything the purchasing company does.
I check friends’ Snapchat stories from time to time, and Snapchat suggests public stories on the same page. I think Snapchat has the same sort of singular data point on me that “this account is likely a straight man”, because most of what they show me are sports clips, woman influencers in revealing clothing, and right-wing influencers talking about culture war stuff. I never view any of that sort of stuff, but it still shows up any time I try to check my friend’s stories. I guess I view public stories so infrequently that they just give me a default generic man feed.