Avoid Duplicate entries from External User
For corporates the Form should have Option to restrict users to submit only once. Avoid Duplicate Entry in forms. Also there are no Fonts Option
This tool really lacks this option. A must have for any form-based app, to not have duplicates
You can already do this: go to Settings and if you have "only people in my organisation can respond" then there is the checkbox to limit the responses to 1 per person.
If you have your form set to anyone with a link can respond then you won't have the option to limit it to 1 response per person because there would be no way for Forms to check this.
I´d say that not only corporates, but all users should have this option open.