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why the email is "optional"? you should try to get emails instead, and build a mailing list of people interested in your product!

It is optional for students, required for teachers. Our focus is on 6th-8th grade, and students at that age often don't have school emails.

English is not my first language, and I also find it useful. Maybe it could be worth having a look at other 'segments'( students learning english?)