CPU mining is only really profitable for some relatively new CPU-only coins.
Otherwise the profit will be really low.
Where do you get free electricity/internet? lol
And I don't know any server provider changing thermal compound regularly and servers are also running 24/7.
In general I'd say CPU mining is only really profitable if your PC is running 24/7 anyway or if you're combining it with GPU mining.
Your opinion is correct, electricity and internet are not free. I just think if electricity and free internet are possible with mining CPU will get a profit hehe.
but there's a friend of mine; he's doing CPU mining in government offices, internet and electricity to be free, during mining in that place.
government offices - well, let's see if it was worth it when he will get caught
At least for my i7 6700k I can tell you that I'm earning ~ 15.28 $ per Week by mining this coin:
https://crds.co/
In combination with GPU-mining it's a nice 'bonus'.
Regards,
Nestade