Isn't it equivalent at the end? If your PoW spam protection is sha256, aren't the spammers losing very real potential to make money?
In that case, what is the difference between demanding a 10 sats payment and demanding PoW that would have earned 10 sats in a mining pool?
How long for me and my cheap Android phone to get to those 10 sats, chugging along at whatever kilohashes per second?
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1.813*10^15 hashes/sat, or at 1MH/s, about 209000 days
lol, nice, cheers to you🍷
The actual question is how much can you make with a botnet .. with a single machine, you are harmless anyways.