They're also very easily tracked. Back in "the day" we used to have fox hunts every weekend to hone our signal tracking skills.
Now amateur radio and low-band transmissions that use sky wave --- not so easy to track. IN fact, very difficult. Drive the federale's absolutely nuts.
I am not a computer guy particularly but can you imagine 100 million, cheap CB radios all buzzing with digital, encrypted various versions of every bodies grandma’s banana bread smothering the signal and each passing data along in Internet fashion?