If he/she wants to leave blockland he can.
I dont see why it is such a big matter.
I agree with you on the point that it shouldn't be a big matter, and I'm not being hypocritical.
But what I was pointing out was the fact that you said, though not directly, you don't care. And if I'm not mistaken, such actions are viable for banship. I'm not trying to start a fight, I'm just trying to inforce the rules without administravite rights.