User Subscribing Process via Newsletter Freebie

Hello! 

So I want to provide freebies in hopes of gaining subscribers and I noticed that people can put in their email and get the freebie, but they technically aren't "subscribed" until they get an email asking them to confirm their subscription. Is there a way to get them to be subscribed once they get the freebie? 

I feel like people won't always double-confirm, especially once they get the freebie. 

I don't know if I am wording this correctly, but I don't want to miss out on subscribers because they didn't know to also confirm in their email.

Thanks in advance for any advice!