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Video of Crawl Optimization: Accessibility - ecommerce SEO: 10-hour course in SEO Fundamentals course by Traian Neacsu channel, video No. 9 free certified online
I will refer to accessibility in terms of optimization for search engines rather than optimization for users.
Accessibility is probably a critical factor for crawling. Your crawl budget is dictated by how the server responds to bot traffic. If the technical architecture of your website makes it impossible for search engine bots to access URLs, then those URLs will not be indexed. URLs that are already indexed but are not accessible after a few unsuccessful attempts may be removed from search engine indices.
Google crawls new websites at a low rate, then gradually increases up to the level it does not create accessibility issues for your users or your server.
So, what prevents URLs and content from being accessible?