In my country, I have to go to my designated box, in the designated table of the designated school, where three people will check my ID against the list of people who can vote there before they unlock the box where I put my vote.
Being foss is not the main attractive for most people, it's the service.
Vaulwarden requires a server, with can be annoying specially for new people, and keepass requires you to manage the db sync.
Where's the private key? I can get a new phone, log with WhatsApp and download all the historical messages without intruducing any additional password or key.
And make it in rust!