@George93 Airbnb has already suspended its marketing operations. But what's the point of taking the whole site down? Millions of people are still using it daily, whether to manage active bookings, resolve claims from past bookings, or (speculatively) plan trips in the more distant future.
Also, even under lockdown there are still people with legitimate needs for accommodation. First-response workers far from their homes, travelers stranded by canceled flights, people in need of isolation from shared households, and people displaced by evacuation or housing loss are just some examples.
Sorry that you've lost your bookings, but no need to throw the baby out with the bathwater.