SimpleX Chat is an instant messenger that is decentralized and doesn’t depend on any unique identifiers such as phone numbers or usernames. Users of SimpleX Chat can scan a QR code or click an invite link to participate in group conversations.
-privacyguides.org
It’s clearly proving to be the most innovative technology when it comes to decentralized communication, in my opinion.
You just never use a desktop profile. You have an account on mobile, and every time you go desktop you sign in with the app and qr code so you’re always using the same db on each machine.
My desktop app has zero profiles and no db; I only sign in with my mobile.