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How would you differentiate between 'genuine dust from legitimate users' and 'dust generated by tech-savvy users just for extraction of the dust-consolidation funds' ?
You cannot. Whatever metrics/heuristics you come up with for eligibility in the limit can be replicated by tech-savyy users.
I don't understand what you mean. How can a "tech savvy" user "generate" dust without paying fees? The balance of every UTXO is already known, so someone can't (would be restricted from) use a UTXO above a dust threshold. That transaction would never be included in the special dist consolidation block, only regular blocks, and would therefore pay standard fees.
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