I am a member of Perfect Sourdough, a group on Facebook that is run by Teresa Greenway with lots of enthusiastic sourdough bakers.
When this article was written, the group had 54 500 members.
Let me give you a hypothesis.
Suppose that 75% of the members are active sourdough bakers who refresh their starter once a week.
How many of them are wasting the discard?
25% of them?