What would be your dream blockchain application if you had no data or execution constraints and transactions were free of charge?

I was thinking about this last night and came up with an idea I really like: it disguises itself as a social network but is actually a marketplace for recommendation algorithms!

Imagine a data feed where you pay a tiny amount (say 10^-8 USD per second) to be on it. Part of the payment goes to the content creator, and the rest compensates the algorithm for recommending that content to you.

You can switch the algorithms that order your content at any moment, and the better job an algorithm does, the more money it earns. Additionally, there could be markets for specialized algorithms, such as those with natural biases, child-specific algorithms, no-politics filters, etc.

Of course, you could choose to have ads, and the ads would pay both the content creator and the algorithm on your behalf.