[samb1729]

> passively charged off your WiFi

I had no idea this is possible. Is there a name for power-over-wifi?

[KomoD]

> Is there a name for power-over-wifi?

Yes, the name for power over wifi is power over wifi (or PoWiFi).

But doesn't look like it's used at all in anything and uses a special "PoWiFi router"(?)

https://modernmobile.cs.washington.edu/docs/powifi.pdf