Construction of farms for mining crypto-currency is not only associated with obtaining fabulous income, but also with significant costs. On electricity. Only in some countries, electricity is not high in price. In most countries, the cost of electricity "on the counter" in the implementation of mining is more than significant.
In America, this issue was solved cardinally and killed at once, at least two birds with one stone. The Mining farm is built on a landfill where various household waste is stored. To ensure its energy, special equipment has been installed in which old car tires are burnt.
Thus, the waste will be processed into bitcoins, which looks like a very attractive idea in the current realities. As a result, the return from mining will increase significantly, which will make it an even more profitable occupation. Such an example can be followed not only in the US, but also in other countries where kilowatt hours are expensive.