> Decisions are efficient if they need to be taken only once.

In other words, open source decentralized systems are the most efficient because you don't have to reduplicate a competitor's effort when you can just use the same code.

> Obviously because they were more efficient than the competition and network effects took care of the rest.

In most cases it's just the network effect, and whether it was a proprietary or open system in any given case is no more than the historical accident of which one happened to gain traction first.

> Having to make choices is a cost for the consumer

If you want an email address you can choose between a few huge providers and a thousand smaller ones, but that doesn't seem to prevent anyone from using it.

> until it switches to rent seeking

If it wasn't an open system from the beginning then that was always the end state and there is no point in waiting for someone to lock the door before trying to remove yourself from the cage.