Google's John Mueller responded to a question related to crawl budget around large scale web sites saying "crawling at a large scale is much more complicated." This was when he proposed two ideas for improving crawl budget but John "both of those are too simplified" and there is more to it.
Here is the post on Twitter:
1- Give a crawl budget to a domain -> divide it according to its subdomains.
— SEO Police (@SEOPolice1) January 3, 2020
2- Give a crawl budget to main domain and subdomains independently.
Which one is valid in the world of Google Search Engine?@JohnMu #seo #crawlbudget
Both of those are too simplified. Crawling at a large scale is much more complicated.
— 🍌 John 🍌 (@JohnMu) January 8, 2020
Gary Illyes from Google did do a deep post on crawl budget for those that are interested, this was a few years ago. But Google has been saying for most sites its overrated to focus on it.
In either case - crawl budget cannot be a simple thing for really large sites.
Forum discussion at Twitter.
