Only a guess, but I left the stock market early and parked the money in the MMAccount at the brokerage house I deal with - it’s a safe haven and earns interest. The brokerage house wants to make money on my money so puts it somewhere - MMMFs- to get interest for a while. I decided along the Sept 18 timeline - along with the multitudes - I want my money NOW. The brokerage house puts in their call to pull back money they have invested in MMMFs and suddenly you have electronic trades pulling out millions of dollars. Not sinister but as evidence, my brokerage house took the shelter of the temporary guarantee program, and I think I’m glad they did.