Now please correct me if I'm wrong but this is only an issue because these blocklists are constantly updated with new domains spreading malware. If we only want

Now please correct me if I'm wrong but this is only an issue because these blocklists are constantly updated with new domains spreading malware. If we only wanted to block the major ad companies of the world we would not need such a high frequency of updates and everyone could manage with a stale list for months before an update would make a difference. Personally I use noscript and other ways to protect myself against malware, so I'm only interested in blocking the major ad companies. Which I could do happily for months using any stale old list.