A team of security experts at the University of Florida working with security audit company CertiK has found that a certain class of cyberattacks could cause a smartphone to catch fire via its wireless charger. The team has posted a paper describing their research and results on the arXiv preprint server.
It’s not like WiFi is continuously sending data. Unless something is actually connecting to the WiFi networks (or downgrading the area by not being able to handle WiFi 7), the beacons are basically empty radio space. BSSIDs themselves have almost no impact on the WiFi spectrum used and you can set up hundreds of nothing APs in a room before WiFi speed degrades/should degrade by a recognisable margin. The biggest downside is that you’ll have trouble picking the right network from the hundreds of “John’s iPhone” networks in the dropdown list.