Am I allowed to use Gnomesequencer?

It's an addon, and some people would argue it does automation, others tell me it's an addon, and theirfor allowed. If something is wrong, blizzard will simply remove it.

What should I trust? Do any of you guys have some insight for me

In the case it is illegal, then go ahead and remove this post, I do not intend to violate the terms of the forum.
And if the thread is gone, I understand the reason behind