Hi @Anonymous ,
Do you want casual labourers who does not have your company emails to use the onboarding template?
Firstly, no matter who use powerapps, he need to has an email. Or else he can not log in.
Secondly, you could share the app to user outside your organization by adding the user as the app's guest, no need to create an email inside your organization for him.
Here are the steps:
1)In azure admin center, select New guest user to add guest users
2)If the guest user doesn't already have a license in their home tenant, assign a license to the guest user.
3)Share the canvas app to this guest
To add guest to your talent, you need to do these firstly:
1)In Azure Active Directory (Azure AD), enable B2B external collaboration for the tenant.
2)Access to an account that can add guest users to an Azure AD tenant. Admins and users with the Guest Inviter role can add guests to a tenant.
3)The guest user must have a license with Power Apps use rights that matches the capability of the app
Here's a doc about this in details for your reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/share-app
Best regards,