because we want favicon and favicon is always in small size..
here are some more sites to catch icons -
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http://www.google.com/s2/favicons?domain_url=<YOUR_URL_HERE>
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https://api.statvoo.com/favicon/?url=<YOUR_URL_HERE>
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http://logo.clearbit.com/<YOUR_URL_HERE>?size=<YOUR_SIZE_HERE>
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https://www.google.com/s2/favicons?sz=<YOUR_SIZE_HERE>&domain_url=<YOUR_URL_HERE>