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Say, someone buys $500 worth of ETH with his BTC. Sends ETH to wherever he wants. Exchanges ETH for BTC there. How much this person will really lose in the process? I assume, it can be more than $5, but I don't know how much exactly.
ralle14 has already given an answer on this but the thing is a bit more complicated.
For larger amounts it makes no sense, over 1000$ the minimum fee for a small trader would be 2$ so it would really make no point paying withdraw and tx fee for the shitcoin.
However for smaller amounts, like 100$ if you benefit from 0.05% exchange fee and the shitcoin you're dealing is really cheap to transfer then you might do it cheaper than a simple BTC<>BTC transfer.
It will always be about how much will a btc transactions cost.
At 30sat/b this makes no sense whatsoever, but at 200sat/b when you try to transfer 25$ it might.
I do not remember where I read it but if we had like 200 nuclear plants all over the world then we could have enough energy to cover all energy need ever.
There are ~500 nuclear powerplants already in the world and they only produce 10% of the energy we consume.