Optin forms are a great way to generate email subscribers but many people hate forms. Please enter your email address, first name, last name, phone number, company name… Many people find it exhausting to fill in multiple form fields and quit without finishing the subscription process. You lose subscribers and potential buyers.
So how can you get the user to subscribe? When creating the form they must complete to get the things you're offering, you have to think first of people that will see your form on the other side of the screen.