Sure it's definitely unfortunate no doubt about that. But going back to my point, there's really nothing we can do about this. If a poor person can mine through a cellphone, what's stopping a rich person from mining through a thousand cellphones? If a poor person can start one business, what's stopping a rich person from opening a hundred businesses that can rival the poor person's business? Just examples. Unless you're going to KYC every single miner so  you can really know that you're limiting your users to a number of devices to limit the hashrate they're using, you really can't fix this, especially in a decentralized manner.