It's something that is more alien the longer ago it was that you got involved with the internet, but I've recently seen this firsthand myself and it works. It's not a general purpose search but if you put in terms related to an upcoming vacation, for example, you will find an endless stream of people's videos of any aspect of it. If your hotel has a suite you're considering, search the name and watch videos to see if it looks worth it, etc. It's basically a way of bypassing highly staged and curated ad photos or videos to see what real people recorded.

It seems more like a side effect of how everyone is trying to become an influencer than a new permanent state of being, but for the time being it can be interesting