You can move the domain to a different hosting service anytime. We do not advice to move the website hosting because of 3 things:
1. Our Wordpress server is optimized for speed which increases SEO ranking.
2. We have license and priority software on our server which help optimize the site and for search engines. These cost hundreds of dollars each month and will not be accessible once the site is off our network.
3. All our websites are on a network which enable us to update and optimize security, software, and plugins together.