Gresham's law: bad money drives good money out of circulation.

Good ideas are held onto and carefully doled out since they confer an edge.

Bad ideas are circulated freely.

That means that all else equal, you'll encounter more bad ideas than good in open channels.

If you get something via email it's likely to be crap.

The world becomes more cacophonous.

"When everyone has a substack, no one has a substack."

This means that trusted recommendations are more important than ever before.