I did $100,000 per day with content locking. But and they are very big buts...
1. I was paid daily, did it for 5 days in a row, then got kicked out!
2. It was back in the day when you could bid for branded keywords with minimal greyhat effort for like $0.01 per click.
3. It took me 3 months to figure out and test my model under the radar. Then i went all in.
4. I treated this as a real business. In a real business the key to profit is maximising average order value. I leveraged the leads and sold one lead across multiple platforms.
You cannot do 2 anymore.