A nuanced explanation of what is meant with wasteful is indeed helpful, as far as possible on twitter.
But in my opinion Bitcoin is certainly ‘wasteful’ is in an ecological sense, long term, if the same ‘value’ can be provided with more energy efficient solutions. Like a fridge (store of food) of type a+++, which is better then type c…
I’m personally not thinking: the food is more valuable in the type c fridge, because it has more electricity costs then the type a+++ fridge (which cools as good, if not better). But even if one would think that the food in the type c fridge is more valuable, it is still (more) wasteful.
Also concerning respect: not only is Maidsafecoin on the blockchain, I’m pretty sure the remaining Bitcoin-part of last years BnkToTheFuture investment round is very helpful 
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