Overview page: https://www.gog.com/en/anniversary
Direct sign up for Galaxy Linux beta: https://www.smartsurvey.co.uk/t/YEF5EV/
around 2011-2015 he did daily drive a mac,
That's what I knew, I never heard he changed to actually using Linux, last I heard he said the Linux desktop isn't good enough for daily use.
I'm glad if he actually uses Linux desktop now. 😀