That's a misunderstanding I think, dictionaries say (of opt-in) - choose to participate in something. - to choose to be part of an activity, arrangement, etc

That's a misunderstanding I think, dictionaries say (of opt-in) - choose to participate in something. - to choose to be part of an activity, arrangement, etc - The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising. [the first few hits on google]