My guess is that’s not you, it’s Flightaware. See here:
ads-b-flight-tracking-f21/flightaware-stats-delayed-t36130.html
I’m currently seeing this myself and I know my Pi is feeding ADSBexchange and piaware-status says it’s connected to FA and sending data…
Data Feed: Live - 37 minutes ago
Feeder Check-in: Live - about 1 minute ago