Based on my own experience so far though, I believe that every follower that subscribes to your profile automatically “opts in” to share an email address. In other words, subscribing to a profile → email can be exported. But I am not 100 percent certain.
Mikhail L. Skoptsov
That would be unethical and a violation of the General Data Protectiom Regulation (GDPR), which has been in full effect for at least 2 years now (excluding nearly a decade-long grace period before that).
Please learn more about marketing ethics. At minimum, look for an overview of GDPR as it applies to email subscriptions. Just the basics will do.