I don’t have a list for you, but I can tell you that Britbox and Discovery+ can be subscribed through Apple. I would offer a piece of advice though, based on personal experience subscribing through Amazon. I found that Amazon sometimes scales down the apps on some of their channels (that is what they call these streaming services) so that some functionality and some programming is not available that is available on the streaming service app if you subscribe directly from that service. There wasn’t a lot of stuff missing, but enough to make me notice. I haven’t noticed anything like this when subscribing through Apple, but it is possible they do this as well is some cases. I tend to now subscribe through the streaming service itself for services like Netflix, Hulu, MotorTrend, CuriosityStream, and others. Again, this probably isn’t that big of an issue, and I don’t know if Apple does what Amazon does, but do your research. Also, I tend to get some services on a reduced annual rate during the holidays when they discount them, and that tends to be easier to acquire directly through the service.