Some of the bloggers and vloggers I read/watch don’t include the link to the original source. They have different reasons for doing so.
Personally, I prefer you know where to find the original source. In many cases, I include a link to where I found it originally.
Likewise, I want to know where a blog/vlog found the original source. I mentioned in another post recently where I often find articles – Some of the Places I Find Articles