Extract emails from Instagram?

Please be aware that I am not familiar with obscure software programs, coding, hacking, etc etc.

I was trying to target members of a facebook group and I am not friends with the members.
It used to be that you could send an email (through gmail) to an @facebook.com adress and it would forward through facebook to their non-facebook email. Apparently that changed in May 2016 and emails can no longer be sent to a facebook email, which completely crushes my entire marketing strategy.

The only other way target these very specific users is through one account they all comment on in Instagram, but as far as I know there is no program for extracting emails from Instagram.

I figure I will have to extract all user data, and then run a search for '@' to locate all email addresses manually. I'm just hoping there's a trick I don't know about or an easier way to do it.

Tips are appreciated.

Please be aware that I am not super technologically included and don't understand techie lingo.

Keep your spam with you.

Nothing more annoying than receiving all those spam mails since I added a mail address.

I think most accounts with an email in their bio are "business" people like you and me. We are not waiting for your advertising. The people you want to reach mostly don't put their mail address in their bio.