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Because they're fascists.

For one thing, I've not seen one source link to any of the images you have used on the few posts I've checked out.
I did comment on one of them about this, and that your "Tongue" quote was a C&P from a FB post, word for word other than leaving off about 6 words near the front of the quote.

@simply2koool, if you PARAPHRASE something, put it in your own words, then it isn't plagiarism, even if you are saying the same thing as the original quote.

Link out to your photo images like this
guu9mk.png
abbey-981904-pixabay
Then they cannot fault you for illegally using non-images.
Even if you are using others photos without express permission, if you link out to/with the URL of the location where you got it, you are citing the source, so can't really be faulted.

To be clear, I am not siding with them at all, I am just trying to help YOU

I get your point about images but if i get them from a website that states the following:

You can copy, modify, distribute, and use the images, even for commercial purposes, all without asking for permission or giving credits to the artist.

Can @steemcleaner or @steemcleaners (thugs, fascist & goons of steemit) force me to give source to the images?

Yes they can. If YOU didn't take the photo, give a [source] link to the image or the website at least.
I do that with EVERY IMAGE, even though I get EVERY (non-original) image from Unsplash dot com, or Pixabay dot com, both of which state just what you posted above.

Work licensed under a Creative Commons license is governed by applicable copyright law.[10] This allows Creative Commons licenses to be applied to all work falling under copyright, including: books, plays, movies, music, articles, photographs, blogs, and websites.
creative commons licenses

It may not be REQUIRED, but it IS common courtesy to at least give your readers the opportunity to go and check out your sources, there might be more there of value to them than that which you have shared.
اس کی ضرورت نہیں ہوسکتی ہے ، لیکن کم از کم اپنے قارئین کو جاکر اپنے ذرائع کی جانچ پڑتال کرنے کا موقع فراہم کرنا عام شائستہ ہے ، اس سے کہیں زیادہ قدر ہوسکتی ہے جو آپ نے شیئر کی ہے۔

Are @steemcleaners & @steemcleaner (goons, thugs and fascists of steemit) sure that the author of the source facebook post hasn't read the fact about tongue somewhere else and he is the one who discovered it?

Doesn't matter, if they can find it elsewhere, then they know you didn't create it.

And that makes me a plagiarist????

I just went to your STEEMIT profile. You have only been here 2 months (joined Dec 2019)

Steemit is all about CREATING ORIGINAL, QUALITY CONTENT.
Everything I saw in that quick glance at your steemit profile was grayed out because you haven't (apparently) CREATED anything, one post after another of just posting comments and quotes, and you expect to get paid for this?

WRITE SOMETHING OF YOUR OWN @simply2koool.
Look at all you've written in the complaints; put that energy into CREATING rather than COMPLAINING.

That is what the exact problem is. These fascists, goons and thugs with longer hands, older profiles and higher stakes want to take matters in their hands and bend the rules as they want to.

That is so not CREATING ORIGINAL, QUALITY CONTENT friendly.

And thanks for accepting the fact that I have put energy into something (COMPLAINING as per you). Atleast I did. I feel good. 😎