Not sure about the use as PTP but maybe for signal to a few customers
Well, why not? It just depends on the signal strengths at both end points. If the signals are good enough, conn. rates are high and you can pump data over it. Since in the middle the 2 antennas are just back to back inter connected with coax so theoretically you have no latency added.
I have been thinking of it to reach a remote hotel in a furthermore inhabited area in a deep valley surrounded by mountain ridges. From my central I can see one of the ridges (that could be reached with a 4-wheel drive through a long journey) and from that hotel you'll see the same ridge. Nowhere near electricity to be found and solar panels with batteries have to be guarded against theft and guard against very high winds. For just a hotel it would make it too expensive for me.... But two antenna's on a big pole cemented into the rock would not make an interesting product to steel and can be made wind resisting while once it works no further maintenance would be needed. I made a link budget calculation some 2 years ago and with the 27dBi radio we had I could achieve a 60dBm signal level at both ends. I presume now with the high power cards that can be done better. It would be enough to put a 40-50Mb link running over it. I could than even serve some weekend bungalows in the same area through a small AP.
It never happened though, it was merely to give an alternative option to the hotel with higher bandwidth than what copper lines brought them. Due the crisis and the financial situation due its remote location the hotel changed hands already 4 to 5 times anyway and recently I even heard its completely abandoned.... So I'm glad I never invested any in that project.....