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But on Steemit Faq says is ok to use pictures from Pexels or Pixabay ... and from the mode they wrote no attribution is required... And why to make attribution to a site that actually is not the copyright holder of that pictures... some pictures don't even have copyright holders as they were released to public domain as I understand...

Steemit FAQ which you say you have read:

Is it okay to use random pictures from the internet?

If you are using an image that is not your own, make sure you are allowed to use the image, and cite the source of the image.

What means source of the image? The site?

Your links are not very cogent...

Your question neither.

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