A reasonable and safe default is to use the same channel for sending me marketing information that I used to request it. Unsolicited marketing is never acceptable.
What about for specialized services that you may not already be aware of? The ideal of advertising is to inform and educate the consumer.
Should non-megacorp specialized services simply not exist? How should they get the word out? The approved channels you speak of are very expensive and highly competitive.
Should non-megacorp specialized services simply not exist? How should they get the word out? The approved channels you speak of are very expensive and highly competitive.