Looks like all they do is: Music streaming directly from your infotainment ($15), live navigation + new voice commands + 24/7 agent in case you need support ($15), both above ($25, wow, such sale), and some AT&T specific bullshit where you can apparently make your car a hotspot ($25).

https://www.toyota.com/connected-services/

All in all, all of them useless, and absolutely not required. All of them are covered by having a phone with Android Auto or Apple CarPlay.