In corporate lingo, I think their “core business” is any vacation rental? Partnering with hotels could perhaps have been a viable path for them to grow that and still fit with their business acumen. But I use other platforms for that service now.
There's no need to be super different. AirBnB has a huge userbase, cashflow, reputation, etc... they ought to provide a good search and booking service to users. (And there's all the potential for adding more and more upsell points and value-added services. From flights, insurance, car rental, local activities, museum and national park tickets to ... whatever they are now fucking around with, like fitness and food.)
