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Oh no! I have to eat more! There's a nice problem to have for once.
I eat more food, you use more power off the grid. I burn kebabs, you burn coal.What happens to my dynamo when I finish the race? I use it to commute to work with for the next 5 years. What happens to your powerbanks and collection of AAs?
hippy
Yes, but there's no such thing as a free lunch. The energy has to come from somewhere. In this case you have to eat (even) more food (7 Days croissants) to generate the power, rather than taking it from a plug into a power bank. I reckon you are probably less efficient than the average European power station so your dynamo will have a higher carbon footprint per Watt.
And your dynamo took resources to manufacture. As do AAs and power banks. None of us know what the relative amounts are but, the rule of thumb is that more complex and more expensive something is, the more resources and energy it takes to produce it. So, I would be willing to bet that many times more resources went into producing your £x00 dynamo than my 4 power banks and 4-pack of AAs from Poundland!