Bitcoin Mining
The Bitcoin and the Cryptocurrency mining industry in general, is now over 10 years old and as you may expect, is now a huge concern.
Initially, miners were individuals, maybe part timers, just earning a few dollars for each coin, often on their home computers.
Mining for Bitcoin is now big business and only profitable for large specialist operations.
You can still mine on your laptop or desktop, or you can even get an app to do this on your phone. The other option is to join a consortium of miners which run cloud based operations.
But don't expect to earn too much from these, especially if they are for mining Bitcoin. Best to do this for education and maybe a bit of fun, whilst earning a few dollars.