No need for a subscription of ANY kind.
This plugin does not check against any remote subscription based lists.
The blocklists used by this plugin are public domain and listed below.
Includes user defined whitelist & blacklists.
Contribute to the plugin on Github: https://github.com/Pross/woo-disposable-emails
The main blocklist is located here: https://github.com/martenson/disposable-email-domains
Settings for the plugin can be found in the main WooCommerce settings panel under Integrations.