This is so heartbreaking, my heart stopped when reading this email. I was a HUGE fan of SQL Saturdays and I became a great pro with Power BI/SQL thanks to SQL Saturday and the outstanding network PASS provided...
Amazon makes life so hard for their suppliers it doesn't even surprise me. I once shipped a box of 10 laptops to sell on FBA (retail value ~$10k) and UPS showed the box as delivered, Amazon checked in the units and showed them available for sale on the website. Then 24 hours later all of them got removed saying I sent the inaccurate quantity in the box and none where now available for sale. The laptops disappeared and I had to do an insurance claim with UPS. Amazon's support was horrible and made me never want to sell with them again. Lots of stories like mine on the Amazon subreddit.
You truly would need a totally cashless economy, Bitcoin would skyrocket if negative rates became the normal. Credit cards would beg you to carry a balance.