Because it's worse for the world. They have a tremendous source of green energy, and they could sell more of it to India reduce the amount of coal and oil India burns, but instead they use it to spin motors to power computers to guess random numbers and hope they make the rich a little richer.
Plenty of countries have chosen to have environmental goals at the cost of making less money.
Plenty of countries have chosen to have environmental goals at the cost of making less money.