the information about signature being added is clearly stated both here on JED and the product homepage.
There is no need to spent hours removing it. If you do not want to support our effort by having the link, you can get the paid version which does not include it. I think the price is more than reasonable.
If you want to remove the link yourself, you are free to do so, but I do not see a reason why you rated us as you did just because of what is generally known.