Netflix and Hulu periodically have been extremely strong in their anime content. Amazon has some stuff too but that shit seems hidden and changed. I think Amazon is focusing more on the outsourcing channels instead of having it on prime. I've randomly caught a bunch of good anime on Amazon that I can't remember the names of.
Netflix and Hulu are similar. Hulu is how I watched Naruto dubbed until mid way through the ninja war. Shit, it's how it finished Naruto and now watch Buruto. Whereas Netflix I think does a better job with movies and actually streaming the content and organizing it. Maybe later this year I'll stop being cheap and go ahead and get an anime/funimation subscription for the Roku app.
I'm good to just hit up animefreak but rely on BGOL to know what to watch.