I share a Netflix account with my mom and I guess technically I have an Amazon Prime account, although I don't think I've ever watched anything on it. I also have a grandfathered Rooster Teeth account so it's, uh, cheaper than the current one and I kind of keep it around just because but I don't think I've made use of it in over a year so I should probably just give in and cancel.
I have Youtube Red or Premium or whatever they rebranded it to. I watch a lot of Youtube so the option to ditch ads on mobile was important, plus the other features were nice. But I don't think I've watched any of the original content because none of it looks... even remotely good. :/
Otherwise sometimes I get a Crunchyroll account for a season. That's all, though, since it gets expensive juggling so many streaming accounts at once.