Comment by naishoya

The base is mass produced; and you are conflating 'vanity' stamps available as souvenirs with the registered official seals for banking and formal business. Anyone can trivially buy a stamp matching all the other toy stamps for that name, but are not official.

Official seals use uncommon font styles and are hand carved natural materials, such that each one has a unique microfeatures inherent to the wood, stone, or horn used, which develop unique wear and ink absorption characteristics.

These official seals are registered and become official for specific scopes of use; some are solely for banking and separate from the other uses like contracts and official filings: which prevents corporate partners and official channels from potentially exposing the banking seals.

The vanity type seals can be used for informal things like putting your name on homework or stamping a package delivery receipt for items of trivial value such as Amazon basics, but it is illegal to use mass produced stamps for official legal or banking.