WordPress is open-source and 100% free. There are also lots of free third-party plugins that increase the functionality of WordPress by adding things like payment forms, contact forms, shopping carts, and more.
Some of the really useful plugins are paid, though. Things like professional form builders, spam blockers, email delivery services, SEO tools, data backup tools, etc all require licenses to use either yearly or monthly.
Because I buy licenses in bulk, I can provide access to these plugins and tools to all websites covered by a care plan. Sometimes that’s a big enough savings to make the care plan worth it by itself!