Around 99% of all chat reports sent to police in Europe come from a single US corporation: Meta. US tech giants are acting as private auxiliary police forces—without any effective European oversight.

https://www.patrick-breyer.de/en/historic-chat-control-vote-in-the-eu-parliament-meps-vote-to-end-untargeted-mass-scanning-of-private-chats/

Curious coincidence that when it seems to become illegal to scan private chats they make their chats less private

Chatmail servers (stripped down email servers that run faster than traditional mail servers and allow only encrypted email, basically eliminating spam) are free to use. You don’t need to use a traditional email provider and delta chat devs encourage chatmail servers instead. (By default you are onboarded on a chatmail server)

These still use the email protocol, making them hard to block by govs, but act more like relays as they only store the messages while in transit.

P2P video calls are in the works for delta chat, currently experimental but soon just as polished as the rest of the ux

It looks similar enough

They are not the same usecase. Matrix tries to have large public groups with message histories similar to Discord where as Delta Chat is more like WhatsApp, covering mostly private conversations in 1:1 or small groups.

You mean for businesses?

Basically only lobbying efforts and not many actual results (other than Signal) sadly