Open your wallet and fill ours

Of course they can pull data from their client. But what makes you believe signal would connect to Whatsapp without your explicit consent? If that doesn’t happen, there is none of your data to pull from someone else’s device. I don’t see why you think the ability to make a connection alone puts your (or any exclusive Signal users) data in any danger.

You didn’t even try to answer my question

Ah yes, I forgot that this has actual screens unlike most other foldables. Thanks for the sad reminder.

What makes you think this means Whatsapp will just get access to signals data? If it works by someone saying “sent specifically a Signal message to this number” then the issue is that person’s handling of your data. And even then, signal could just play dumb until you yourself specifically say “allow Whatsapp messages from this number explicitly”.

Edit: also, wouldn’t this make it verifiable that Whatsapp is actually using proper encryption?

What category would that be, put of curiosity?

But who wants to deal with excel then. Running python in the cloud and have it put data into an excel file is something I can already do, and as a bonus I can do it locally too.

I hate their entire policy around what you can and cannot say or do, on their platform or somewhere else.

KeePass can sync no problem. Either right in the app like KeePass2android via WebDAV or just plain old file in a synced folder.