It's a public wifi network that is broadcast from a device that is (probably) on your LAN. Attacker connects, finds some vulnerability, and has unrestricted acc

It's a public wifi network that is broadcast from a device that is (probably) on your LAN. Attacker connects, finds some vulnerability, and has unrestricted access to the LAN. That is just one attack vector. ;tdlr it degrades your security, and is generally annoying.