What Difficulties of trying to measure number of web pages?

Measuring the number of web pages presents several difficulties, primarily due to the dynamic nature of the internet where pages are constantly being created, modified, and deleted. Additionally, many web pages are hidden behind paywalls or are not indexed by search engines, making them difficult to count. The vastness of the web, with millions of websites and subdomains, complicates the task further, as traditional counting methods may overlook numerous pages. Lastly, variations in definitions of what constitutes a "web page" can lead to inconsistencies in measurements.