The wording on the Plugin where you click to sync says ‘Link Audience With Store’, in Mailchimp every subscriber is classed as your ‘Audience’. My customers in my Woocommerce store are my customers and become my Audience when they are turned into Subscribers.
Hence the interpretation I had was that it would link my Mailchimp Audience to my store. Not upload my store customers to my Mail Chimp Audience and then charge me $500. If the wording was the other way around and said turn your customers into your Audience I wouldn’t have clicked sync.
As an improvement this definition should on the plugin should be changed to inform the user that all of their customers from Woocommerce will be uploaded and turned into their Audience and there is a potential for additional costs.
I think what the plugin can do is really very good, but for a small business like ours we cannot afford a shock $500 bill.