I mean, assuming we’re talking about a government trying to shut down or snoop on an email service – They’re probably not going to go door to door confiscating

I mean, assuming we’re talking about a government trying to shut down or snoop on an email service – They’re probably not going to go door to door confiscating millions of devices; the cost to do that would be astronomical. You’d still be at risk if they were targeting you personally, but not if they were targeting all Helm users en masse. That’s a big improvement. And even if you were targeted personally, you’d at least be in a position to defend against surreptitious snooping, assuming that took the form of agents physically entering your home to hijack the device. Of course, there’s a lot of counterfactuals baked into that scenario. Helm does not currently have millions of users, for one. For another, the EC2-based proxy service run by Helm is a single point of failure that someone could take down, though supposedly Helm will release tools to replace it with your own server. And most problematically, the closed-source software could be silently subverted by Helm in an update, with no reasonable means for the user to detect this, even in theory. Still, it’s a lot better on that front than most cloud email services.