How does Google calculate this quality score?

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For large online shops, in fact, the main problem is not to rank the individual product pages, but to be able to have them absorbed by the bot. It is easy to notice, in fact, for new sites and those still lacking authority, how the absorption of the pages is slower (and often incomplete), compared to sites considered more authoritative. To overcome the problem, one often acts by setting the right priorities of the sitemap and pinging Google the individual URLs.

Returning to the crawl budget of a site, if to the vastness of the url product park of a site we also added a series of "non-monetizable" urls, not useful to the user and to the bot itself, we would create iran phone number further crawling requests to the bot, which would disperse the site's budget even more and decrease the crawl rate of the really important urls (e.g. product landing pages). Furthermore, duplicate urls create another problem: the dispersion of the page's pagerank towards non-canonical resources .

The canonical page
Google considers the most important URL from which the user accesses a resource as a canonical page. Consequently, if there are other URLs to access the same resource, these will not be considered canonical.
A site that has several resources accessible from tens (or hundreds) of different non-canonical URLs is squandering its crawl budget and page rank, and as a result, it may experience a drop in rankings and cannibalization of keywords from non-canonical URLs, which is when multiple pages compete for the same keywords.