Anil Dash, a tech writer and entrepreneur, writes on the web's design, social media, JavaScript, and the ethics of tech.
HN commenters link his Medium posts on the web's missing building blocks and the Chan Zuckerberg Initiative, though one notes the irony of discussing web centralization on Medium.
Worse, linking to Amil Dash's article on medium [1], of all things, makes complaining about oligopolization of the Web kind of inconsequential.
[1]: https://medium.com/@anildash/the-missing-building-blocks-of-the-web-3fa490ae5cbc
The second half of this piece states the fear pretty well: https://medium.com/@anildash/how-to-look-at-the-chan-zuckerberg-initiative-f357e5dd8c63