Given new commercial entrants into the Fediverse such as WordPress, Tumblr and Threads, we suggest collaboration among these parties to help bring the trust and safety benefits currently enjoyed by centralized platforms to the wider Fediverse ecosystem

In such a system, the server on which a post originates would submit imagery to PhotoDNA for analysis

This same technique could also be applied to other hosted media analysis mechanisms (e.g. Google’s SafeSearch or Microsoft’s Analyze Image API40

While large social media providers utilize signals such as browser User-Agent, TLS fingerprint,8 IP and many other mechanisms to determine whether a previously suspended bad actor is attempting to re-create an account, Mastodon admins have little to work with apart from a user’s IP and e-mail address, both of which are easily fungible.

So basically people might have joined the fediverse in large due to privacy reasons but if fediverse is to be “ethical” it should share your images with big tech as well as track you better.

He also laments Tor and E2E messaging.