It’s old magic too and in a pinch it works reasonably well.
We use this as a networking option for an old dorm I was in which didn’t have ethernet and the concrete walls between rooms made Wi-Fi unusable.
Blocks of rooms were not separated on different circuits which made this possible
But I wasn’t facility. I was a student.
The dorm itself did not have internet and had no plans of running ethernet or providing internet to students.
I got internet through a wireless access point, positioned very carefully in window for a WISP. And they distributed that to rooms near me.