[jcul]

I also wonder how it applies to Matrix, which is encrypted and technically decentralized.

However most users will be using the matrix.org homeserver, which makes it effectively centralized. Though I can still create my own homeserver that talks to matrix.org.

Would matrix.org be forced to offer scanning / a backdoor on the homeserver? Or would they be forced to add something to the official apps, which is pretty ineffective as there are many client apps.

All in all this proposal seems like a complete mess.

[tekknik]

Reading the text, they will require the operators of the server to provide the filtering and would be liable if they didn’t.