By offering a free plan, bloggers who are interested in writing about your tool can do so freely. Even if they don't become regular users, their readers might. And, if nothing else, it's a great link building strategy. For example, if you search for mentions of HootSuite (freemium product), you'll find 10M results. If you search for Sendible (premium only competitor), you'll find 160K results. Similarly, if you search for mentions of MailChimp (freemium product), you'll find 10M results. If you search for Aweber (premium only competitor), you'll find 718K results.

https://www.forbes.com/sites/sujanpatel/2015/04/29/7-examples-of-freemium-products-done-right/#5e4d037e6f15