[GekkePrutser]

Ah ok, I was aware of that usage back in those days (fidonet), but I didn't realise it was still used as such. I haven't seen that function in any modern app, and most have their own spoiler tag implementation (like black on black so you only see the content after highlighting)

In cryptography circles it seems to be kind of a running joke ("just use ROT13 encryption and you'll be set!" is something I've seen several times) ;) I know it was never intended to be secure.

But it makes sense then.

Of course if you work with ROT13 a lot, you will probably gain the ability to read it just by viewing the ROT'd code, defeating its purpose :) The structure of words also gives away a lot, since it doesn't affect spaces, capitalisation or punctuation. I still don't think it's very good at this usecase either.