Well, on-line space and real-life space are very different. I don't think it's very useful to compare "equivalent" precautions by analogy like that.
The reason for that should be clear enough from the examples you gave. Some types of precautions are much easier, sensible or acceptable to do in one type of space than in the other, or vice versa. Some precautions are clearly ridiculous, or just don't carry the same kind of protection in the other type of space. In real life you also don't need to worry someone downloads a copy of your drink :-)
I didn't pick the examples because they have a clear and useful digital equivalent either. It was to demonstrate some other points: Sometimes we have to take precautions to protect ourselves, even if they inconvenience us, even if they do not protect 100% perfectly. And even if the dangers we try to protect ourselves from are clearly illegal, we still take the precautions because we don't expect the law/police to always be there and protect us before they happen. In fact, for real-life we generally prefer it that way, we don't really want to policeman at every corner, hovering above our every move, we want to be able to take care of ourselves, by ourselves. Because sometimes there is no one else.
I'm arguing that we should aim for a similar way in on-line space. Not by carrying the protections to their literal not-quite-equivalent real-life analogies, that would be silly. But to create a similar way of being able to protect oneself, in an (on-line) socially acceptable manner, without having to rely on the state (or a corporation).
I'm arguing that in on-line space, one of the options for precaution should be the ability to pick pseudonyms. They come much more natural to the on-line world than the real world, because on-line you're not attached to a physical presence. This is an advantage, you can't do it in real-life. It doesn't make sense to carry the analogy over, wearing masks isn't quite the same, plus it's not socially acceptable. There are of course many other on-line precautions to protect yourself against dangers, but we were discussing pseudonyms.
BTW a quick side-note, not directed to you in particular. I find that on HN there is a strong tendency to try and find real-life analogies for all sorts of cyber/digital on-line concepts. Often resulting in discussions that carry a metaphor way too far. "No it's more like trying to tie your shoes while your feet are in a locked safe, but your socks are the key ..." -- eh. My point is, in my experience, such kinds of analogies are only useful when trying to somewhat explain a technical concept to a non-technical person. It's not useful at all as a starting point to reason from, just because the analogy (mostly) holds as far as it's descriptive of the concept, doesn't mean the other properties of the analogy that you can reason from there are in any way predictive of the technical concept by the same line of reasoning. Isn't this called "leaky abstractions" in programming? :-)