Income from ads is one source of income. Content creators on centralized platforms like YouTube have different sources of income from their videos. They can do affiliate marketing and earn from that. Sponsored posts, selling products, donations, driving traffic to their website and conversion are some examples.
Yes, I agree with you. People who make content on centralized platforms, they do not own their content and deal with different issues. Hive is a better option that gives the solution. Thank you @bchainbastards for sharing this.