SOI stands for Single Opt-In, which means that the users only needs to enter his email for the subscription. That is much more easy to promote for advertisers because it’s not like a DOI that they need to verify their email.
SOI stands for Single Opt-In, which means that the users only needs to enter his email for the subscription. That is much more easy to promote for advertisers because it’s not like a DOI that they need to verify their email.