It's not disallowed, it's just not good. You might not pay attention when your employees are looking for other jobs, but most business owners do, and react rather negatively to it.
> it is not such a scandal as OP makes it out to be
OP posted a one-line "Tell HN" comment, you're actually the one calling it a scandal.
You are right re: the second part. I projected the "WHAT A SCANDAL??!!" comment thread to the OP.
As an aside though. Is there something wring for an employer to know ahead of time if their employee is planning to leave? Of course if an employee updating their profile gets you panicked, then you are not doing something right.
So I am speaking of non paranoid situations.
So in the ideal world, there's nothing wrong.
However, we don't live in such a world, unfortunately, and should adjust accordingly.
There are many small companies that would struggle horribly if one of the key employees would leave, and eventually they will. Also, some employers expect loyalty and treat it very personally if they know that someone's is definitely looking to jump the ship.
It's right, I agree, but that's how it is usually.