I don't see the problem, either...
The link is, apparently, just another method of compensation. Say the code costs $x... for those that don't wanna pay $x, there's another method of payment offered: ($x - $y) + promoting the author of the script.
You look at it and see a programmer charging you more to remove a link. I look at it and see a programmer charging you less for marketing.
If you don't agree with the terms, don't use/buy the product. Go elsewhere. In theory, we're a free market.
