I got a 1099K from PayPal last January unexpectedly. I’d accepted about $2000 in payments through PayPal, some for parts I sold, in some cases from a friend who neglected to use the friends and family option and I didn’t notice. I didn’t know how to handle it so did best I could, and swore off using PayPal since.
I’m not sure what is changed now, as they already were reporting people who received over $600.