This seems to be the answer
The Variflight people are kind of implying they are better than Flightaware, go figure.
You all have to spend 15 minutes and read the page. Its funny.
Variflight is growing! 87 airports now! I write this as sarcasm.
“flight happiness index”? I want to know more about that
My last 13 hour flight wasn’t that happy.
At least it cannot be the page load happiness index.
Site is loading, but more like back in good old modem times
However I would like to find the RTL card they are using in their feeder.
Original article in russian https://habr.com/ru/post/423989/
Translation to english https://sudonull.com/posts/9124-VariFlight-ADS-B-Flightradar-in-Chinese
An attempt to look under the screen was a success from the second approach. The lid broke off and turned out … … as it turned out everything was in vain - the marking with chips was carefully cut down.
Looking ahead, I will say that it turned out to be an almost ordinary RTLSDR receiver - RTL2832U DVB-T (0bda: 2838)
Looking at the chip I would say so. I assume they removed the markings because of license agreements. I wonder who builds the board? I bet a long but successful seach will turn up who builds the board.