No proprietary software can truley provide secure messaging
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My response to the body of this post is https://www.privacyguides.org/en/real-time-communication/
This might address the URL of this post (I've never interacted with "iCloud" so I don't necessarily know what would be a good replacement for it): https://www.privacyguides.org/en/document-collaboration/
Is Briar any good?
You may want SimpleX. You can still self-host your own server if you wish, but it doesn't have nearly the metadata issues of matrix and encryption keys are stored in a database that you back up instead of constantly breaking
The two encrypted messaging platforms I currently suggest are XMPP or Matrix. Both are usually fine and are decentralized. The main thing with them is to either self-host or choose a server you trust to set up an account — which applies to the Fediverse in general.
Out of curiosity, is there anything stopping you from suggesting SimpleX? How does SimpleX compare to XMPP or Matrix?
Mostly just that it's still pretty new and thus hasn't been as polished or scrutinized yet. Haven't tried it myself. For the sake of the OP's question, it may also be notable that it's a UK company.