Like so many things these days, people ignore FCC requirements for a license. For a short time, the FCC tried to license radio control (R/C) transmitters. No one bothered, so the FCC decided that maybe that was another bad idea. Amateur Radio (hams, to some) is another field where people don't bother with a license, knowing that the government doesn't have the facilities or the ambition to prosecute people without the required license.
Floyd, K6BSU