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It depends. Truly working offline, which is as private as it gets in many scenarios, isn’t really feasible with web apps.

You could also work in a windowless steel box inside a cave at the top of a mountain, if you really want to move the goalposts.

Why is this moving the goalposts?

Native apps can work reasonably well offline and online. Web apps can’t, currently.

"Progressive web apps" can be installed to be used offline: https://en.wikipedia.org/wiki/Progressive_web_app