The Way Forward

https://help.actblue.com/hc/en-us/articles/19342854603287-Does-ActBlue-share-my-personal-information-including-email-address-and-phone-number

They explicitly state:

"We never sell or share your personal information with anyone beyond the group you gave to, and ActBlue will never text you."

But of course, candidates sometimes run up debt and then sell their contact list to pay it. Harris had $20 million or so of debt and likely had to sell her list. It was regarded as a "high fatigue" list (people unfortunately donate less after a loss).

A smart, single buyer would be gracious and hold onto the list till the fatigue subsided, but given the quantity of missives recently, it seems the worst case has happened: it was sold to multiple entities and they all raced to use it while it still had value.

ActBlue gets caught in the crossfire of all this selling because everyone uses them to process payments.