There should be force start button or setting.

[Vitaly Shukela]

I see "Turn on wiki or tethering" and HTTP and RTSP ports are closed.

Although Anroid does not know about custom reverse tethering network set from root, I expect Spydroid to be able to just listen 0.0.0.0 and accept connections from nowhere.

If I enable Wi-Fi it works also from cable.