Primarily, the project is aimed at people who:

have difficulty/concerns with securely caching physical seed backups (evil maid attack)

want to memorise their seed words but struggle to do so

want to carry their seed words with them at all times

have limited access to trusted 3rd parties

live in areas of conflict, war zones, etc.

regularly travel or move around

have no permanent fixed abode.

In practice, though, it can be used by anybody who wants to more easily and more reliably commit their Bitcoin seed words to memory.