This makes sense. Navigation maps cost $$$ to maintain. Subaru has been charging for built-in navigation for years (it comes free for 3 years with most purchases) with the expectation that most people won't renew when the free period expires. The navigation is very good as whatever service they use is able to account for construction and other map changes significantly faster than Google does. But the UI is really slow.

The alternative is to use CarPlay/Android Auto and the navigation app of your choice for free. (Until like Toyota Ford starts requiring a subscription to use CP or AA. They had planned to do this several years ago but decided not to after backlash.)