Yeah, 3.3g/kg is really high, and I don't see how you could get there without living on shakes. From that examine.com article:
Eating more than 2.6 g/kg (1.18 g/lb) is probably not going to lead to greater muscle gains, but it can minimize fat gains when “bulking” — i.e., when eating above maintenance in order to gain (muscle) weight.
Eating more than 2.6 g/kg (1.18 g/lb) is probably not going to lead to greater muscle gains, but it can minimize fat gains when “bulking” — i.e., when eating above maintenance in order to gain (muscle) weight.
There doesn't seem to be a lot of evidence for the kidney thing as long as you don't dramatically increase protein suddenly: https://examine.com/nutrition/can-eating-too-much-protein-be...