If they are a big vlogger that has been social media digested people may find out.
If I died a month ago on a mountain, no one but my wife would have known and I doubt she'd put it on any social media sites. I don't have a lot of "close" friends that keep in touch with me enough for the news to travel, so I really think if the people are not socially accepted, or networked in, no one would know. I have slowly started networking with vloggers but none of them know my wife, nor do any live local or ride with me, so not sure anyone would find out if I passed away until months down the road if ever.