what is make this public on form report?

I can suggest that you reffer to JotForm's Terms-of-Use.

As between JotForm and you, you own all rights to your Forms and Submissions. When you make a Form "public", you grant JotForm a worldwide and fully sublicensable license to use, distribute, reproduce, modify, adapt, publish, translate, publicly perform, and publicly display your Forms and Submissions (in whole or in part) in any format or medium now known or later developed. Submissions and Reports will only made public with your permission. JotForm does not pre-screen forms or submissions and you agree that you are solely responsible for all of your Forms and User Submissions.

The reason we have that term is that if you create a public report without password protection and if google lists your report, we are not responsible for it. Even if you don't share your reports with others it is best to password protect them if the data is private. 

Hope this helps!