Datafox Subscription Required?

Is any separate purchase or subscription required to use Datafox for a client who has purchased Supplier module?

Are there any downsides to enabling Datafox, and can it be disabled if desired after enabling? If disabled, are any supplier details achieved through Datafox such as corporate website or address, removed from a supplier record?

Is it possible to use Datafox to enrich existing supplier records and add details like corporate website?