You get to decide for everyone what is and isn't contributing to their lives? I've learned many things from vlogs over the years and they have improved my life. Not all vlogs are equally beneficial for everyone, but that doesn't mean none of them have any value. And youre also assuming that a vlog is necessarily meant to improve the lives of everyone watching. There could be other reasons for one to make a vlog. They can be digital records, much like written ones people used to keep. I wouldn't say historical records are useless.