Can someone help me understand the underlying motivation behind this?
It makes sense that some crawlers, in the style of Google, would want to index the entire internet. But what is the point of the same crawler re-fetching a page they already fetched an hour ago? Or possibly all this traffic is just independent entities, each trying to cache the internet? The scale of bot traffic makes this seem unlikely.
What's the motivation behind the same entity re-fetching a page it just fetched less than an hour ago?