Presumably having a flipper in your pocket, if the ban happens, will subject you to legal liability and something tells me the penalties will be less than stealing a car. So the people who are trying to use the flipper zero to commit a greater crime will simply not care and carry on because who cares about a misdemeanor when you are about to commit a felony.

Organized criminals can get bespoke hardware simply by hiring skilled labor overlooked or outcast by industry. Skilled tech-based criminals can build their own kit.

This hurts mostly people who want to get into some form of security or hacking and at best maybe stops high school antics but threatens to upend the entire way hackers have always honed their skills by doing and tinkering and also upending the small industries that support them and the security professionals who use the gear in production.

Edit: typo