[luma]

Given the ESP8266 brings a WiFi radio and 32bit microcontroller for < $2 on your BOM I think this sort of overkill is warranted. 433mhz provides no mechanism for link-layer security which seems irresponsible in this day and age.

[z3t4]

You are better off with insecure/obscure radio then insecure wifi (no password or wep), and might exposit the device to the Internet which opens the attack range from your neighbors to the whole world. At least you do not have to worry about your 433mzh device becoming part of a bot net.

[StavrosK]

ITEAD do make a 433 MHz version of this stuff, but yes, that's just asking for trouble, given how trivially I can sniff and replay those codes.