What is the most profitable art to sell online?

I'm curious, what kind of art consistently proves to be the most profitable when sold online? Is it traditional paintings, digital art, or perhaps something more niche like photography or sculptures? I'm interested in understanding which medium attracts the highest bids and generates the biggest profits for artists looking to sell their work digitally. Are there any specific platforms or marketplaces that are known for being particularly lucrative for selling art online? I'd love to hear your insights on this topic.