The same is also true when you switch over your site to CDN. But if you remove the CDN or otherwise change it, you will also see the same kind of Googlebot activity on the site when that’s done.
John Mueller from Google confirmed this via twitter.
The increase crawling activity is simply because Google is reindexing these pages with a CDN addition, removal or change. Site owners will also see the same kind of crawl activity when they do a site move or switch to HTTPS or make other major changes to the site.
That said, site owners should be concerned about an increase in crawling is if there is an issue with the increase crawling causing server issues, such as Google but crawling the site so hard it is taking down the server. While this is pretty unusual it can happen, especially if there’s something about the site that has created infinite URLs for example. So if you have made major changes to a site, expect increased crawl activity, but with no associated changes to a site, it can sometimes highlight issues Googlebot has come across, such as a million pages being crawled from a calendar on a site or parameters gone wild.
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