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That 100mb space is for uploads not submissions. you have a 100 submissions a month and 10 Payments a month on the free plan. If I am not mistaken you still have an unlimited amount of forms you can create as they do not count towards that 100mb.
What @kingkest have mentioned is correct, the 100 MB cap is not for the number of forms that you can create with a free subscription.
The 100 MB limit is for file uploads,
Here's what you can get on free subscription.
You may also check our Pricing Guide for reference.
I hope this helps. If you have any other question, please feel free to contact us again and we will be glad to help you. Thank you.