Hi Michael
All so very true. There are lots of 2.4G signals around, even the humble microwave oven. Although if an oven leaks too much RF out of the “box” it really should be discarded as unsafe.
Even my after market reversing camera is 2.4G with the TX at rear and a RX unit up front. When reversing out of my driveway I get all sorts of interference from local sign...