More than half of your emails may not reach your readers due to spam filters or changed email addresses. Those that do reach their target may not even be looked at.
Users wont sign up for newsletters as they expect their email to be used to deliver unsolicited adverts.Its simple. No name, email or any other personal details required.

You can put anything you want in your RSS feed, without worrying about accidentally triggering a spam word in a spam filter.
RSS content using topic channels has the potential to push highly relevant content to your subscribers safefully, so important and critical content is sure to be delivered.