I think if you go into poor enough countries it is quite possible, electricity is not that expensive in some of the third world countries because of the method electricity is produced and honestly in countries like USA it is super high because companies know you have a higher purchasing power so they abuse it, same medicine that costs 0.10 cents in third world country (even less sometimes) may cost 100 dollars in USA (literally seen one myself) because they know USA citizens can afford it.
So, if you are in a third world country with cheap life and literally 100 dollars a month is above living wage you can just keep on grinding it forever to make money and you can be very lucky time to time to actually pull of couple big wins that will set your life straight.
The faucets which are available in casino sites cannot be claimed if you have balance in your account. I mean you have a account with zero balance and you claim a faucet, now you cannot claim another faucet until you lose all the balance while playing gambling so the point that under developed countries gamblers keep on grinding the faucet is not right.
Not all casinos applies that rule, at least there are some casinos that lets users to claim the faucet although the account balance is not zero. One example of the site is crypto-games.net, I tried it several times while my balance is still few satoshi, but I still can claim the faucet. I live in third world country but I do not even interested to use faucet for profit as I know it is wasting time, even if I do it then get a good luck then I can be considered as faucet abuser which may result in account getting blocked/banned.