It is commendable that some of them use

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This method is less common, but it also works. For example, the user is offered to register via email in an online competition and spend the points won in the same store.
Affiliate programs

An online store chooses a business in a related field as a partner and offers whatsapp number list its customers to subscribe to its news. Cross-promotional mailings, recommendations on social networks or offline meetings can be used to exchange addresses. For example, a makeup school can offer students to subscribe to the online store's mailing list in exchange for a bonus.
Conclusions

In the rating of the 100 largest online stores, we did not find many examples worthy of imitation. combinations of methods, for example, end-to-end subscription forms + pop-ups + mobile applications. There were also severe cases when the online store did not try to take the user's address at all. In any case, collecting addresses is half the battle. The main thing is to correctly set up an email strategy so as not to lose user loyalty. But that's another story.