There are cases where a free plan actually makes sense.
Does the usage increases with time?
Many users start using JotForm with very low usage and then after using it for months or years they go over the 100 submission/month limit. I believe Evernote also had a similar pattern. Dropbox probably also has it.
Can you use network effects?
Only a tiny percentage of our users share their forms with others on JotForm Form Templates gallery. Tiny percentage of 1 million users is still pretty good. So, we have all these ready to use form templates for other users. It saves people time to be able to find a form template for any use case. If we only had paid users the number of shared templates would have been very low.
Does the usage increases with time? Many users start using JotForm with very low usage and then after using it for months or years they go over the 100 submission/month limit. I believe Evernote also had a similar pattern. Dropbox probably also has it.
Can you use network effects? Only a tiny percentage of our users share their forms with others on JotForm Form Templates gallery. Tiny percentage of 1 million users is still pretty good. So, we have all these ready to use form templates for other users. It saves people time to be able to find a form template for any use case. If we only had paid users the number of shared templates would have been very low.