I'm also in my 40s and had the same "old man yells at cloud" judgmental reaction, but when you think about it, it's no different than watching TV. I think of all the dreck on that glowing rectangle that my generation wasted hours of each day on, passively consuming. It's pretty much the same as watching some streamer, so hey, whatever floats their boats.

I think I'm just way too old to understand the specific allure of streaming random people talking about random, mundane things. My daughter watches a few streamers, and in my view, watching over her shoulder, they are all just bland, boring nobodies[1], talking about nothing in particular. They just talk about their day, talk about video games sometimes while playing, talk about other videos they're simultaneously watching (yes, streaming someone talking while the streamer himself streams another video!). It just seems such a pointless waste, but I think back to the stupid things I liked as a kid and I guess it's no different. I just hope she grows out of it and (with my parental guidance) starts getting motivated to do actual things rather than sit there watching other people do things.

1: I know some streamers have particular interesting or extraordinary talents, but I'm not talking about those shows.