You say it's free money, but there are two aspects that your article misses, and they are crucial:

1. If you sell naked calls (sell a call without owning the underlying), you will have to post margin. At 52k a contract, the margin requirement is going to be substantial as you'll be on the hook for 100 shares at $1,900, or $190,000. Maintaing a margin isn't free and you run the risk of being margin called.

2. Theta decay accelerates with time, so 1 year from maturity, you're not gonna make bank. It's going to take a few months to see larger gains out of theta alone. In the meantime, TSLA could go up substantially.

Overall, don't sell naked calls on stocks like Tesla. Come to think of it, don't sell naked calls.