Thoughts of self made game challenge runs

Obviously you don't have to do them yourself but what do you think about challenge runs and somewhat the effect they have on YouTube with YouTubers making content off of them

Obviously not all games are the same but certain challenges may involve something like no healing, no saving, 1 life, weapon/weapon type restriction, speedruns and more. I feel challenge runs are fun to watch and also to play assuming you're good enough at the game or have a certain play style