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Unfortunately unless there are financial incentive to do that it will not be adopted. Maybe try to get the porn industry to adopt these services first, maybe others will follow.

Telegram has proxies built in. You can activate it with a tap.

Briar[1] supports Tor and works really well, but at the moment is limited to text-only chats.

1: https://briarproject.org/

This reminded me of something I hadn't thought of in a long time. In the earlier days of bitcoin, there was a chat app that was using encrypted messages on the blockchain... I just spent ~5mins searching for it but can't remember the actual name. Is there anything else using the blockchain for chat?

I think you talk about bitmessage. It doesn't use blockchain, though, which is kinda useless, there is no need to store messages permanently without the way to remove them.

These systems mostly use blockchain as PKI or similar to bitcoin mempools with public crypto, but not store messages on blockchain.

Ah yes, seems I was misremembering. Thanks for the info.

Could it have been Status? [1]

[1] https://status.im/private-messenger/