[hellojesus]

I suppose you could use stenography or something to embed chats in pictures that are client-side scanned.

I use grapheneos and can create storage scopes so that the scanning app would only have access to files I deliberately allow.

Doesn't solve traffic analysis. Maybe some more advanced methods that encrypt over https could work.

[EGreg]

Unless a lot of people are using it, they’ll just go after anyone who is doing suspicious things like using grapheneos

[hellojesus]

Yes, but in what way? Short of the outlaw of general computing, what could they possibly do to stop it?