I'm not sure if this is the right forum, I will let the Moderators decide. I'm posting it here because quite a few Technic builders have their models on Rebrickable.
A couple of days I received the e-mail below. I have not answered it yet.
After checking the website it looks like a Rebrickable clone, down to the MOC numbers. Tomik started a discussion on the same subject on Rebrickable a couple of weeks ago, but hasn't had many replies.
Has anyone else been contacted by them? How did you react, if at all? Is this considered theft? I'm kind of on the fence on this, as my instructions are free and they are not reselling them, and I don't mind the additional exposure. On the other hand, I do see it as a problem for Rebrickable, who is having their website cloned. I'd like to hear your thoughts on this.