Re: Hmm
Risky - dunno.
Half-baked and ineffective as described? Definitely.
If you kill the wifi cleanly and immediately upon DNS lookup it will just switch to cellular. You need to mark "an idiot" by collecting his DNS packets, then wait until he establishes a TCP connection to anywhere (the first connection after the lookup is likely to be instagram or f*book) and only after that kill the WiFi mid-session so it buggers up the TCP connection.