Ad injunction question pertaining to cyber law

This question requires an attorney who knows about Internet law. I have created a chrome extension. My users install my software and they know upfront that they will see types of advertisements in return. We are very clear on what types on our home page, we don't hide it in small print fyi. Pop under ads are 1 way, and the 2nd way we WANT to offer are native ads ad injections. You can see outbrain.com or taboola.com who are 2 of the largest that offer this. The difference between them and me are they work directly with web publishers who insert a piece of code on their website and for me, I don't work with the website at all. I can just insert the same type of ad space on any page on any website they visit. can those sites that we are changing the ADs on sue us for doing so? for example cnn.com if we change the ADs on cnn.com can cnn.com sue us?