No site I use/rely day to day has any ads so those won't have a reason to ban me. For the rest, not only do they have very little to ban me on (no account, etc - best they can do is IP address?) but an IP ban would actually be beneficial as there's a chance it'll also propagate to their trackers and essentially mark my network as invisible or untrusted, not collecting/processing any data from it as it's considered fraudulent.