And yet all of these originally decentralized systems end up facing some degree of centralization. The promise of a decentralized system is that anyone can build anything they want, because no one owns it.
The difference between Class 1 and Class 2 problems is that Class 2 problems cannot be solved by the market alone. Entrepreneurial spirit and the profit-mode are perfectly capable of solving most Class 1 problems.
In February 2018, a Facebook researcher all but shut off the News Feed ranking algorithm for .05% of Facebook users. “What happens if we delete ranked News Feed?” they asked in an internal report summing up the experiment.