Privacy Policies - A Review
Secondly, there is a consensus that it is unfeasible to constantly be removing content from caches and backups. This means that your information may linger long after it has been removed. However, this concern is present in any case, as anyone with access to it might conceivably store it for their own use.
Thirdly, as any webserver will log details such as IP address and browser details from users, these services do so as well. Most of the services use these for maintenance/troubleshooting issues, though they are also some of the more relevant information for law enforcement, should they request it from the site. A few of the sites used this for commercial ends, but most did not.
Similarly, you may expect that a website will do anything in its power to try to trace out your exact journey through their service, ostensibly to improve the product.