How would you design your app if you are worried that an authoritarian state might seize all of your user's data and work?
How would you design your website if you think the countries where your hosting datacentres are located might descend into civil war? Or get invaded?
Most of us who are working on web apps and websites today are doing so in an unstable world. The UK and US are fast becoming more authoritarian so it might not be a hypothetical question for much longer.
@baldur Ah, now I understand your question. I guess the idealistic responses would be encryption, anonymisation, decentralization, redundancy. But who will pay you for developing an app in such a world? Except for those we want protection from?