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Samuli
Agree Li is nasty. But the human body is only about 25% efficient so much worse than power banks.
Time spent making fiddly parts still has a carbon footprint: if it's people doing work, they need to eat and consume other stuff which all has a cost.
The only bit of the cost of the dynamo which doesn't have environmental cost is the IPR or value in its patents.
The challenge with a lot of green technologies is to get them to the point that they use less energy in their manufacture than they save in their usable life. A bike dynamo has its advantages but it's far from obvious it passes that test!