Here are the responses I received:
How do I make ActBlue stop emailing me?
You can unsubscribe from ActBlue emails by clicking the "unsubscribe" link at the bottom of any email you've received from them. If you're receiving text messages, replying "STOP" to the message should also opt you out.
ActBlue itself doesn't send emails on behalf of campaigns or organizations, but when you donate through their platform, your contact information may be shared with the group you contributed to. If you're still receiving unwanted emails, you might need to contact the campaign or organization directly. Their contact details are usually in the footer of their emails, or you can reach out to ActBlue for assistance here.
1support.actblue.com
How do I stop ActBlue from providing my information to organizations other than those I support?
ActBlue does not sell or share your contact information with third parties, except for the group you donated to or in certain legal circumstances. However, if you want to limit how your information is shared, ActBlue provides an option for donors to opt out of sharing their contact details with campaigns and organizations 2.
To do this, you can:
Visit your ActBlue Express Fundraising page.
Go to the fundraising form you used and select "Actions" → "Edit and preview".
Click the blue "Edit" button on the top left.
Select "Recipients" and scroll down to the "Email permissions pop-up" section.
Choose "Yes" to enable the opt-out option.
Click the green "Publish" button to save your changes.
If you're still receiving unwanted communications, you may need to contact the campaign or organization directly. You can also report potential violations to ActBlue by emailing info@actblue.com with details of the issue.
1support.actblue.com
2www.donororganizerhub.org
Thanks for your post on DU. I learned something new.