So there is an equivalent for Android TV! Stube = SmartTubeNext?

I realize this is the current branding. Yes you're correct. SmartTubeNext. It appears on the TV as an app called STube

Is there something like this for iOS?

I've been using uYou+[0] & AltStore for about 6 months (since I switched to iOS from Android & Vanced) and I haven't had any problems with it. It has both SponsorBlock & normal ad block.

[0]: https://github.com/qnblackcat/uYouPlus

Only sideloaded.