In reply to Zi Yang.

This again? It's not unethical if it's in compliance with the licence in which it was released under. If a community or developers don't like the GPL, then maybe WordPress isn't for them. There's other software out there that has more restrictive licencing.

To say the WP community is against sharing GPL licensed software is highly inaccurate and simply not true. WordPress is built on GPL.

Please, read the licence.