Well some people have access to idled extra rows of cabinets old servers in a noc, free power and hardware equals time to get creative with mining low diff alt coins.
This is pretty much the only case for CPU mining. Finding some random altcoin that everybody has lost interest in and consequently the difficulty has dropped. Of course at that point the coin is to be considered dead and won't even be listed on an exchange. Those are dead coins, zombiecoins. Examples would be Kittehcoin and Lottocoin which are now worth less than a Satoshi each. You could CPU mine those dead things and hope for a revival if the dev puts time into it - basically gambling.
But if you have that much free time, I would make my own scam coin, premine 80% of it like BCN, and then promote the hell out the scam. Is it immoral - yes. Is it what almost all the scammy altcoins are doing - yes.