I'm trying to parse your second sentence, and I think I somewhat agree in a technical sense, but I think it would be fairer to say, Duo forces a second factor o

I'm trying to parse your second sentence, and I think I somewhat agree in a technical sense, but I think it would be fairer to say, Duo forces a second factor on you, whereas Google gives you the option; and in the long run it's better to not babysit people through a "lie." Last sentence? Serious question. Can you? I was just presuming that you can't; i.e. if I were to build a freedom-reducing proprietary solution like this, I'd keep the the key on my home servers and only deliver the 6 digit codes?