This is simply untrue. I know a large BTC mining operation and they don't use water. They use the gases coming off from oil mining that would otherwise go into the atmosphere. BTC mining takes advantage of surplus energy so it's creation doesn't go to waste. The mining is good for our environment. I've also read about solar panels sitting above crops to power BTC miners. These panels covering the crops help conserve water while helping the plants grow better.
People can talk all day and say things could have been used for something else or something better. Most of the time people can think of an idea but nobody does it. Don't be hateful towards BTC miners because they actually did it. Like someone else mentioned in another comment, water would be much better utilized by not going into thousands of pools and golf courses or watering lawns. You would probably need investors to have a large operation but it doesn't make these people elite or whatever whales are. The people I know who mine using oil exhaust are wholesome good people just making it by like everyone else is and trying to live their dream. The difference is BTC (not other cryptos) using renewable energy puts it in a unique position to be a good product for everyone as it's a money that is equal for everyone to use, unlike traditional fiat currencies.
Explain to me how crops of any appreciable size are being grown in the shade and harvested around solar panels? This sounds like feel good baloney to me, but what do I know. I only spent several years as a teen while growing up on a farm and currently homestead.