Today I've noticed that some spammy websites use PHP to get my images and show from their own domains. Since I use hotlink protection, my warning page - with links to main sections, end-up in their websites, with urls like http://example.com/some-keyword-randomnumber.jpg
Also, there are PHP proxy websites, scrappers, etc. that I block and as a result show my '403 Forbidden' page with links to my website.
It kinda looks like I'm link spamming those websites. Is there a method to prevent scrapped error pages from harming backlink profile?