Why would you not expect someone to charge for this? There are many services that charge for hosting private packages (rather than making them public to the world); I'm not aware of _any_ service that does so for free.
I read private, and didn't notice the word hosting, so I thought it was an on-prem package indexing. Uploading their proprietary code to some random hosting provider isn't something that would fly with any of my clients, so I didn't expect that. Whenever I see a product landing page with pricing, they title it Pricing, so calling it something else sounds like someone playing coy with the fact they're a payed product. Compare with Artifactory, which is up-front about it, and offers much more than just a package index.