Can I make all Youtube channels have the same audio level?

This just happened so I am making a topic. It has happened before but I forget to ask.

I was watching this video and had to turn up the volume, then I went to this video and had to scramble to turn down the sound because it was so loud!

I get that different Youtubers use different equipment, have different mixing equipment etc. but why when uploaded doesn't the volume come out the same?

And since it seems it will not is there a way I can tell Youtube to normalize the sound?

Youtube does have audio normalization built into it. I believe it's automatic, but trails the upload.