GamingKingJames: That was before I knew what GOG Galaxy was, now it has peaked my interest a little bit, right now I am playing my game using the offline installer and my achievements are still updating, which is why I now want to try and test to see if it will still work if the game is not on my account anymore.
It is not that easy to delete your account. You have to do a request to GOG staff.
And all rather pointless anyway. Any details saved to the cloud, can only be accessed via a GOG account, and if you create a new one, you lose access to the old one.
You buy a game from GOG and it is yours. However, services like the cloud are a different matter, and could disappear any time.
So long as you have downloaded your game and backed it up, you remain independent. Independence means DRM-Free, and without that you are not DRM-Free.
Being tied the GOG store or to Galaxy means you are not DRM-Free.
Downloading offline installers and backing them up is the only way to truly be DRM-Free.
Sure, maybe you can backup a game install folder and be DRM-Free Lite, but there are no guarantees.
P.S. It would be a rare day for some authority to check your ownership license of a game. That would mean coming to your premises and wanting to see a receipt, and even then a lack of receipt is no proof of ownership status. If in 20 years GOG no longer exist, and their records are unavailable or not easy to access, who can prove anything.