I have an educated and uneducated opinion on this:
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Educated opinion - I believe while spam has decreased, I also believed the incentive for spam remained… meaning we had solved nothing and it will come back again. Like an open window in a store after hours…. We still needed to close the window even if people stopped robbing it.
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Uneducated opinion - I suspect (based on anecdotal evidence) that spam proposal had decreased just as you write .