optin
- Decide to join, e.g
- Decide to join
- Sign up for an offering
- Sign up for advertising emails, say
- Sign up for a mailing list, say
- Join a mailing list
- Elect to take part
- Elect to participate
- Choose to join
- Choose to be included
- Allow oneself to be data-mined, perhaps
- Agree to receive marketing email, say
- Agree to be spammed, say
- Agree to accept email ads, e.g
- Accept cookies, e.g