Why OCR doesn't recognize this simple letter?

Hello!
I found this API and trying to make it work. Unfortunately, for some reason it doesn’t recognize a pretty simple example.

The file URL is here: https://freebies-for-startups-authentic.s3.ca-central-1.amazonaws.com/f.png

f

My code is here:

ocr_url = 'https://api.ocr.space/parse/image'
headers = {'apikey': key}
params = {
            'language': 'eng',
            'filetype': 'png',
            'url': 'https://freebies-for-startups-authentic.s3.ca-central-1.amazonaws.com/f.png'
        }
response = requests.post(ocr_url, headers=headers, data=params)

ParsedText is empty string. Is this sample too hard for this OCR engine? I can’t believe… Thanks!

This is hand-writing, or? This is not supported by the default OCR engines currently.

It would be available as custom project for Enterprise customers.

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