Posted November 19, 2017
misteryo: I am wondering if it is not mandatory, might a whole lot of users be hacked and not know it because they do not use 2FA.
Earlier GOG switched it on for everyone, so it is enabled by default. One would have to deliberately switch if off to get rid of it. I think that was a good move because apparently there were lots of rarely used GOG accounts which got hijacked, and when the original owners later tried to access them again, they couldn't (email was changed etc.). So now everyone has the extra protection by default. Considering how much talk there was earlier about those hijacked accounts (when 2FA wasn't enabled yet), I'd be surprised if masses of people switched it off, or then taking extra measures (like using a very strong password which they only use on GOG).
Even I started using 2FA at that point. The reason I didn't use it earlier was because I let Firefox clear all cookies on exit, and sometimes (when the IP address changed) that would trigger 2FA. As a workaround, I started using Chrome instead for all such sites where I want to keep the login cookies (like GOG.com and Humble Bundle), and I use Firefox for the rest.
Post edited November 19, 2017 by timppu