My guess would be JavaScript

Proton has paid tiers covering their actual costs, and they aren’t out to kneel at the altar of capitalism, driving shareholder value, etc. Google literally sells you as their product, so Gmail is free that way.

Because they actually run their own infrastructure? They own their own IP space, so the only thing they’d be disclosing is the ISP’s they advertise that IP space through, which you could glean via traceroute anyways.

Don’t get me wrong, these Proton blog posts are all just thinly veiled ads for their own products, but knocking them for not being transparent about their tech is disingenuous, with their track record of the opposite. Are they open source? No. Are they forthcoming on the steps they take to protect your data (including from themselves)? You betcha.

Dropbox on the other hand has been breeches multiple times, and each time they slow walk customer notifications to try and mitigate damage to their brand, to the detriment of the customers.

I still don’t understand why they can’t make this into a single app.

Is this a Swiss sorcery thing? Capitalism doesn’t allow price reductions that easily…

It is planned, and “in the works” for at least two years at this point. It’ll happen, eventually.

I knew about the SMS thing (Android only), but thought they had yet to release user names as a feature. I see no settings related to user names on iOS. The SMS retirement was to remove the ability to use Signal to replace an SMS app on Android.

Since when does Signal not require a phone number?