didnt wanted to argue there.
for me its ok because installing every service on a linux machine would be to hard for me.
Still not FOSS. It's nuanced, but an important distinction
https://github.com/Start9Labs/embassy-os/blob/master/LICENSE.md
Discussion
If it works for you that's all that matters! I will be testing it out on a new machine myself, and do think it's a great platform. Just want to point out the difference between true FOSS and open-source code (both are important IMO)