If I provide you a list of URL's to an indexing service... and among those URL's there are 3 or 4 that are already indexed in Google... is there the risk that the already indexed URL's get de-indexed by Google?
As mentioned above, normally this shouldn't hurt old links, now ... you don't know how indexing services go about getting links indexed. In view of all the services that have closed and those that are no longer working, you can expect some backhat methods that you would not use yourself. Pay close attention to whom you entrust your work to and that goes for everyone.If I provide you a list of URL's to an indexing service... and among those URL's there are 3 or 4 that are already indexed in Google... is there the risk that the already indexed URL's get de-indexed by Google?