If you can’t trade bitcoin directly, nothing’s stopping you from earning it.
One way to earn bitcoin is to set up a bitcoin mining rig. However, this is far more likely to be lucrative if you spend a lot of money on mining hardware, and it might take a while until you earn your money back – and all the while you’re exposed to bitcoin’s volatility. There are easier options, however, for less technical users such as,
Joining a bitcoin mining pool.
Still, some of the mining companies have market capitalizations in the billions of dollars.