Probably nobody cared about internal us fires. On the weekend a new war started between Azerbaijan and Armenia. And there are a lot of other wars in that region where someone might hide one or another flights.
Apparently Flightaware also had issues which could explain that. ADSBExchange was still up but they're probably just too unknown for attackers to care. If you bring down Flightaware and Flightradar you can prevent most people from tracking those flights.