If you had to cancel Netflix (or never had it) Tubi is free with ads and you don’t have to download anything or sign up. I don’t remember there being ads for me, or if there were it wasn’t enough to remember.
I will admit the stuff on there mostly isn’t that great. At least for my interests. But have a dig around, you might find a trashy cult classic or something just ok to have on in the background.
If YouTube is pissing you off with intrusive ads and you don’t want to pay (I don’t) they also have ambient relaxation videos like of a crackling fire.
Ps. There are also library based options but I know less about that as I never bothered to set it up and they’re also expensive for libraries. (Kanopy was free with a library card or student login but is shutting down because the cost of so many people using it.)
But I guess if more people use them it can justify more public library funding, so… I don’t know. If that sounds good maybe try it.
I’m also considering checking out Plex.