Darth and Justin sahred a lot of content about the Spark problem here:

• The Chain Of Command: How Facebook's Libra, Bank Regulators, and PayPal Built A New World Currency
• The PayPal Presidency Pt. I: Biotech and Biosurveillance with Max Jones
• #1275977

I had to paste the links here without a tldr, anyway these materials are full of necessary details.