More details? When I search it in DDG, I get a lot of results. The first from from peertube.tv, then joinpeertube.org.
this post was submitted on 04 Oct 2023
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This has been a thing for awhile. Bing/Duck Duck go just have a blanket ban on the search peer tube to block any adult content.
Some places if you just change your search restrictions from strict to moderate you will get results but apparently not every where.
Even if I set ddg to strict filtering it still shows a result. 
What your seeing isn't a result, it is just a feature of Duck duck go that gives you a quick summary of something pulled for Wikipedia. Looks like the filtering forgot to block that feature.
Yes, yes, everyone knows what that is. The point is that it gives something even with the most strict filtering