One of them never sends automatic messages, but you can request them via SMS
One of them sends them every time your SIM is put in a device with a different IMEI (which doesn't help if you factory reset and is just plain annoying if the settings are already there, because on my Android you can't just swipe away the notification, you have to *actually go into the settings list and clear*).
One tries to "detect" if you have invalid settings and sends them if they think you need them, except the autodetection always gets it wrong. Literally always. Like someone installed the gravity sensor upsi…