@artgirl They disappear because the platform is new and they can't handle the storage cost of the videos. You can prevent your uploads from disappearing by hosting them yourself and paying for storage. Then they will play on dtube as long as you store them.
This issue is not limited to dtube, even YouTube itself is not profitable for the same reasons. However, Youtube has a a big enough audience to break even, but not able to make any profits yet. Check out this article:
https://www.cbsnews.com/news/4-reasons-youtube-still-doesnt-make-a-profit/

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