"Note that some especially egregious content (highly illegal imagery, pornography, repeated and malicious rule-breaking, etc.) as well as obvious spam may be removed without warning." 

Of course. This is to be expected with material that is obviously offensive or copyright infringing. It needs to be cleared up & removed as soon as possible. And I am sure the "authors" get just as upset when the legitamacey of the material is questioned.

"Did the freesound moderators give an explanation for the removal, then?"

This is the message that was left on each ticket of each deletion:

"Hey there. Thanks for contributing to Freesound.
Unfortunately we've had to delete this sound."

"Freesound only hosts files that are not copyright infringing. We reject audio taken from copyright protected media without permission. Please do not upload other people's works. Only sounds that you have made yourself or own the copyrights."

"If you'd like to find out what you can upload, please have a look here:
https://freesound.org/help/faq/#what-sounds-are-legal-to-put-on-freesound"

"Thanks!"

Half of the second paragraph is inaccurate in regards to the site rules.

"Please do not upload other people's works. Only sounds that you have made yourself or own the copyrights."

The majority of Freesound's content is licensed as Creative Commons. This statement is in contrast with CC philosophy & that particular moderator doesn't seem to understand the acceptable licensing of materials on the site. The rest didn't apply to my uploads.

"Freesound only hosts files that are not copyright infringing. We reject audio taken from copyright protected media without permission."

The moderator either didn't read the FAQs that he/she linked to or didn't understand them. Yes, it clearly states that copyright infringing material is not allowed. And it also states, in regards to submitted materials not created by the uploader:

"One exception to this are sounds that are already licenses under a clear license that is compatible with the licenses we use, for example a creative commons one."

After a couple back & forth emails, the moderator that replied to my complaints stated that what happened was not the norm. He/She also complimented my understanding of the CC licensing. Not that I pretent to have a perfect understanding or to never make mistakes, but it felt good to hear that & feel validated.

What I think happened was the original moderator that deleted my sounds saw the word "YouTube" in one of the descriptions & a red flag went off. So he/she just assumed the upload, & 10 or 11 others, were invalid. Even though I left a clear description of the Creative Commons source. And I do understand the risk when getting material from YouTube. I have seen many videos where I questioned whether or not the uploader understood the CC licensing that they used with materials that appeared to be from other sources. I skipped many until I found ones that I felt confident that the uploader was the original author. What was funny was that some of the sounds that I had uploaded were remixes/edits from CC0 licensed sources I had found on Freesound.

I explained that I wasn't upset that my uploads were called into question. I was upset with the quick assumptions & immediate deletions without being given a chance to explain. And it upset me even more when they explained there was no file history that could be examined after the deletion.

But the second moderator has assured me that I won't have the same problem with future uploads. I apologized for not being more patient, as this moderator showed patience & a better understanding of the rules of the site & helped me to feel heard.

Anyways, I didn't mean for this response to be so long. I really am over it now. lol