> But apps are a hassle. Apps mean your project suddenly requires an Android or IPhone smartphone, where before — if I understand correctly — only a modern bro

> But apps are a hassle. Apps mean your project suddenly requires an Android or IPhone smartphone, where before — if I understand correctly — only a modern browser was required. Is it worth it to limit your project to just smartphones? As long as the project runs in a desktop browser, screenshots are possible of course, regardless of whatever you do with an app. Aside from that, it depends on what your audience is. Do you want to sell a service to people who need to tick boxes for the tools they use? Go crazy, introduce pointless features that harm productivity, and ultimately don't solve the problem (even if only the analogue hole remains, but I suspect taking screenshots is possible on most devices), but which allow them to say that they've taken additional measures to prevent leaking. If you want to provide the tool to people who actually take privacy seriously, a hack like this is just going to make people doubt your technical skills.