From a historical (and academic) perspective, most decentralized services seem to tend towards monopolization.

Telephones, radio broadcasting, and the Internet are all examples of once-decentralized, democratizing forces that were eventually centralized from a corporate control perspective.

I don't know if this will change in the future; it'd require either a very active legal agenda or incredibly engaged citizens/consumers.

"The Master Switch"[1] is a great book on the above.

[1] https://www.amazon.com/Master-Switch-Rise-Information-Empire...