Hey! I had the same problem and found a solution.
Create a static list (in HubSpot) at Contacts → List and select HubSpot at the Divi (or Bloom) Email option module. In the module, settings select HubSpot as the Email Account. If that’s your first time you need to connect your account because Divi is not able to fetch your lists, yet. Click on add, type in any name in the “Account name” field (the field has a wrong title, it doesn’t refer to your HubSpot account name, you can choose any name you like) and add your API Key (can be found/created on the HubSpot website at Settings → Integrations → API Key). Afterwards, you should be able to fetch the created STATIC lists in the Divi Email Optin module.