Iran had changed its crypto-regulation, and now the bitcoin-mining requires a license from the government. But if you have the license, you get cheaper electricity from the provider. Additionally, the Iranian central bank announced, they will purchase all the mined bitcoins from the miners.
The last catch of the authorities is a huge illegal farm with 45000 ASIC. It consumed around 95 MW of energy. Based on the news, the country had shut down 1620 illegal mining facility in the last months, with more than 250 MW capacity machines in total.