> As a current user of our Forever Free plan, you'll now be in the new Free plan as long as your audience size is 2,000 contacts or less. The new pricing structure is based upon the total number of contacts you can market to, which now includes unsubscribes and customers who have simply not opted-in yet. You can check your Mailchimp account to see how many contacts are in your total audience. And keep in mind, you can always archive contacts you aren't using. On June 15, 2019, the pricing change will go into effect if you have more than 2,000 contacts.
So it sounds like it very much does change pricing on June 15th, at the least meaning previously Free users will now have to pay, unless they go in and manually archive unsubscribed emails.