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If your filter is fine enough, sure. But then you force higher energy costs to clean the water.

"Not that I am going to do this," Sure, but eventually you'll wash your chain, and reapply the powder. So the particles end up in the river anyway.

If you're interested, read up on how PTFE is produced. Specifically the case in WV and Ohio with DuPont's precursor PTFE plant.

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Unfortunately you are right. But what can be done? There are dry PTFE lubricants available in market and they work so well compared to traditional Grease in dusty environment that I don't see people giving up these.

Try spray wax. Works amazing on my motorcycle chains, and doesnt fling off or collect tons of dirt.

That said, motor oil with a brush, wipe it off, ignore dirt between oilings was shown to be the best for motorcycle chains, not sure about sprockets.

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