I thought that the number of Bitcoins has almost maxxed out. Not too many more to find. Lots of work for that ‘last one’. May not be worth it?
Do these mines mine some other crypto?
Supposed to be limited to 21 million with 20 million “mined” so far.
Cryptocurrency mines of this size are made to mine one specific algorithm, not one specific coin. So it could mine any coin that uses the SHA-256d algorithm, such as Syscoin or Namecoin. But Bitcoin is by far the most popular one on that list.