I avoid most of those videos, but sometimes I just click on them due to a lack of something else to watch and with nothing better to do.

And Unreal in this sense is the Unreal Engine, the engine that was used to make Unreal Tournament, but others can use it too to make their own games.
Which reminds me to this guy who does have a clear title, and the video is actually about what the video and thumbnail are saying (although audio-only, video is just because JewTube doesn't support audio-only):
https://youtube.owacon.moe/watch?v=Qqx3HsTZW2E