> In your case I rent some box from you which will lose almost all its intended function the moment your company goes bust or I stop paying you an annual fee.

No - we do not rent hardware. When people buy the server from us, they own it. Full stop. There are ongoing costs to make email at home work: a static IP address with good reputation, a security gateway, traffic, etc. If people don't want to pay us for those costs, they will pay them to an ISP and/or an infrastructure provider like AWS. The ease of setup and management comes from the integration of hardware, software and service.

> I am completely at the mercy of your original and continued good intentions as in addition to using your lock-in for a big price hike later you presumably can also snoop on my data.

This is true of any paid service you use right? They can increase your costs at any time. I'm not sure why you think there's something uniquely bad about us for this reason. We have pretty clear values around wanting to know as little about our customers as possible and designing our products end to end around that. We have worked pretty hard at reducing costs, bringing the server price down 60% while doubling its specifications. Our goal is to make this as cost effective and accessible as possible for everyone. We are not interested in locking in customers - it's easy for anyone to take their data off Helm and go to a server of their own making or another service of their choosing. That's not hypothetical - like any company, we have churned customers and supported them in their migration off our product. It's easy to sling these hypotheticals you are concocting but they are not borne out of any reality.

> As far as I can tell there is no really substantial trust differentiator to protonmail.

There is actually a substantial difference. Protonmail holds your data on their servers and therefore can turn it over without a warrant. Well it's encrypted, right? So what could any entity do with that data? Well, Protonmail may be compelled to modify their service to intercept the password on login to decrypt your inbox and turn it over to a government authority (if you don't think that can happen, see what the German government did to Tutanota).

We aren't in a position to do that. Even if the US government came with a court order for your encrypted backups from us, we don't have access to the keys to decrypt them. If we were asked to make firmware changes, we would be retracing the steps of the FBI/Apple San Bernardino case and would enlist the help of the EFF, ACLU and others to fight. I personally believe the case law is pretty clear that they wouldn't win, which is partly why the FBI relented earlier.

> that you can remotely update anytime you feel like it

You make this sound like a terrible thing but really it's not. It allows us to keep our products patched and secured over time.

> In what ways is that better than running an IMAP client on my laptop and using it to send data via protonmail, using my own domain, and keeping offline copies of everything (with a periodic upload to backblaze or some other e2e encrypted backup solution)?

I didn't say people couldn't roll their own solutions. Sure they can - it's just more work, hassle and fragile. And I already covered the tradeoffs of keeping that data in the cloud. Protonmail has access to all your email in the clear (inbound and outbound). We do not and anyone running a server at home would have similar privacy. That's a clear difference.

> Accessing the data is not enough because what you are selling me is not an overpriced and unergonomic hard drive. You are selling me the ability to send, receive and store email (and likely more).

Actually it is because we were talking about data ownership. Your specific dig was about how "own your data" was in any way true ("or that "own your data" is in any meaningful way true" in your parent post).