Hey, I really like to see users bringing their own IPFS nodes online, a few tips and tricks, your files will be automatically pinned by the node when you add them in, this can be disabled however.
Additionally in the end you state "when my file is requested by other users, my node will upload it.." it could be clarified that the file is uploaded the ipfs node that dtube serves the video from not that the video will be served directly from your pi to a user, there's an intermediary which is why you can sometimes see a bit of a delay between when a video is first uploaded to when all of its versions are available for viewing, the intermediary server has to take a copy of the file before it can start streaming it
If you don't want to rely on youtube for video encoding you can check out https://github.com/dtube/ipfs-uploader which is a current version of the dtube encoder, it will work on cpu and gpu systems.
To see how it's deployd you can also check out https://github.com/dtube/deploy
But again, very impressed, wunderbar!