Living in Japan I've avoided Flipper Zero due to the law basically saying "It is illegal to own tools primarily used for crime" (think lockpicks, etc). With Flipper Zero primarily being a RFID hacking tool, you are one officer knowing what it is and considering it a tool for crime away from being locked up - at least for the 21 days they get while they investigate you.
Now Flipper One seems like something probably legal.