Here's a way around it:
Add language like this at the bottom of your action!
HINT If you don't have an email address, enter your phone number followed by "@noemail.com" in the box labeled "Email."
Example: 1234567890@noemail.com
See an example here: https://actionnetwork.org/letters/tell-mn-lawmakers-to-stand-by-hospitality-workers/
Email address is always required because it is a unique identifier for all kinds of online activities. Let's help our folks get used to it!