The function of a hammer does not extend past 'hit thing' or 'pull nail', Obviously this kind of function can't be controlled in its application as people can swing their arms however they feel which makes any sort of restriction on hammers redundant given their utility.
Flipper Zero on the other hand is a toy with no/little actual utility that enables users to perform illegal/dangerous tasks like steal cars, that would not otherwise be possible except via less accessible/illegal means.
