Hi @magali,
currently, D.Tube no longer uses its own IPFS node (as you can read here, they now have their own solution). Back then, they all re-initialized the nodes regularly (so there is no unique peer ID). If you now want to pin videos again (but they are no longer streamed via D.Tube), then download the video first using wget and then add it normally with your node.
Big f_cking Edit: Since when do they use IPFS again?!! 😮 Can they make up their minds? Seems to be running IPFS again now, but I think the problem will still exist, but I will stay on it.
Thxalot,
JanSe