Articles are getting too redundant thanks to what I'd bet is AI. Not even sure if this one is reading past a couple sentences, which basically repeat what other people have said but slower.
You'd be better off reading this tweet that the author referenced but failed to link.
As Proton put it on [Twitter]:
OpenAI says it runs locally and doesn't build an index. Local execution isn't the same as local processing. The moment ChatGPT summarises a thread or drafts a reply using a hosted model, that content leaves the machine.
Here's a glance at how poor the writing is. Compare this section
“This is no different from email, SMS, Slack or Teams”
It is.
Think Signal, not SMS.
SMS, ordinary email, Slack and Teams don’t provide the same promise of privacy as iMessage, Signal, or Proton, where the service is designed so the provider itself can’t read the end to end encrypted message content.
To this section:
Why iMessage is different
Think Signal, not SMS.
Some people think of Apple Messages as ordinary text messaging, but it’s one application supporting 3 different messaging services: regular SMS, end to end encrypted iMessage and, more recently, RCS.
It's the same thing, said slowly, and said twice. For no reason.