I started first in 2012-ish with Linux. That’s when I first heard of it, and decided to spin an VM with Ubuntu 12.04. Though initially I didn’t use it in real hardware for sometime, eventually I did install Fedora and been pretty happy ever since. Nowadays mostly use openSUSE and Arch.

Usually, Denuvo is mentioned in the EULA of the games, so going by this metric, it’s unlikely for it to have Denuvo since there’s no mention of it.

No, you’re not. It’s for whenever you’re browsing games on steam, like the discovery queue or when there’s a big sale, it will show up before the description if it has, like this.

For steam, there is also this curator that marks it.