Flipper Zero isn't what's causing this, the bad "smart" devices are, and the culprits themselves, of course. Just because you can hack a system, doesn't make it legal. Know your local laws. Mine says "accessing any IT system without authorisation is punishable with imprisonment from 3m to 3y; accessing the aforementioned system with the purpose of obtaining data is punishable with imprisonment from 6m to 5y.", vague enough for all of these things.