An AMD RX580 has a hash rate of about 30mh/s.
If I calculate the mining profits with this 1 card (cryptocompare) then I would generate $34milion profit in 1 year.

Am I missing something here? How should I calculate the exact mining profits for Monero?
30mh for ethereum.
XMR, depends on the memory, if its samsung, ull get 1000h/s, other memory types will get you around 800-900h/s