In fact, Bitcoin was originally coded to be mined by CPU power, not GPU. Only later did Bitcoin core developers decide to harness the greater hashing power of GPUs. Eventually, even they were outclassed by specialized hardware called ASIC miner, standing for Application Specific Integrated Circuits. Any serious Bitcoin mining farm now consists of ASICs. Otherwise, it couldn’t be profitable.
In fact, Robinhood faced some outrage earlier this year when it restricted trading on meme stocks including GameStop and AMC.

You may be wondering why BTCC pool is not on this list. For those who don’t already know, BTCC was China’s third largest Bitcoin exchange and also operated a large mining pool. Back in 2017, BTCC pool was mining about 11% of all blocks and controlled about 240 PH/s. In November of 2018, BTCC shut down indefinitely “due to business adjustments”.
Mining for fun and profit If you're curious about mining, it's surprisingly easy to try out mining yourself, although you'll be lucky to earn even a penny. Just create an account at a mining pool such as BTC Guild, download mining software such as cpuminer (minerd.exe), and run the software to start mining. For a pool with low difficulty, you should get shares in a few minutes; in a pool with a higher difficulty (such as GHash.IO), it may take you an hour or two to get a share, which is more frustrating.[3] The screenshot above shows what mining looks like as you get shares and blocks get mined. I got lucky and it only took me a minute to successfully mine a share. A minute later someone successfully mined a block, so the pool tells everyone to start over. Another block was mined less than a minute after that - although blocks are 10 minutes apart on average, the times can vary widely. It took 12 minutes for my next share to be generated. After running for a while, I earned 0.00000043 BTC, which is a tiny fraction of a cent. Bitcoin mining is an "arms race". Originally people could mine with the CPU on a regular PC, but that hasn't been practical for a while. Next mining was offloaded to GPUs. Now, mining is done with special-purpose ASIC hardware, which is rapidly increasing in speed. For-profit mining is very competitive, and you'll need to look elsewhere for information. If you want to try out mining just for fun, you may prefer to mine a currency such as Dogecoin rather than Bitcoin. First, Dogecoin uses a different hash algorithm which doesn't work well with ASIC hardware, so you're not as disadvantaged compared to professional miners. Second, because dogecoins are worth much less than bitcoins, you'll end up with a much larger number of dogecoins, which seems more rewarding. For Dogecoin mining, I used the dogepool.pw pool somewhat arbitrarily. The process is almost the same as Bitcoin mining, except you use the scrypt algorithm instead of sha256d. There are many other alternative cryptocurrencies to choose from.