Why is crawling user profiles disallowed?

I was wondering why was my profile not indexed by Google. So i looked into DO’s robots.txt and there was a line:

# Only allow crawling of the canonical user profile
Disallow: /community/users/*?primary_filter=*

So can you explain why is profile crawling disallowed and what is a canonical profile?

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It is indexed. And by canonical URL means DO want to index /community/users/someuser but not /community/users/someuser?primary_filter=something Canonical URLs are used by many sites to avoid having search engines indexing multiple versions of the same data, just with a slightly different URL.