Why are there so many, what seem to be passenger flights, at the moment ?
Whereabouts in the globe are you looking and what level of traffic are you expecting to see?
The States hasn't shut down domestically, plus they have a massive amount of freight traffic (Fedex, UPS etc).
There also hasn't been a complete shutdown in Europe. BA, Air France and others are perhaps running a very minimal passenger service domestically, there are the specialised freighters flying around(Fedex, UPS, DHL,), there are a few Long haul repatriation type flights being flown by the likes of BA and Virgin and also some of what appears to be passenger traffic using normal flight callsigns being flown by the likes of Aer Lingus, BA, Virgin, etc is actually them using their passenger aircraft such as 747s, 777s 787s etc to carry freight.
Compared with how Flight Radar looked even a month ago tonight the skies look very empty.