Last GM vehicle I had (2015 GMC Sierra Denali) included 5 years of OnStar with the vehicle purchase... that covered the entire warranty period.Yeah. Since Rivian is executing this basically after Tesla's process it will be superior. OnStar is by subscription and very costly, and often involves chatting with operators if you ever actually need any service. What Rivian seems like it will do will be a far superior customer service that I guess will be just a free part of ownership! My question is, what will GM/Onstar and others do in response to Tesla and Rivian's system? If it turns out to be more economical these other traditional auto-manufacturers may have a dilemma of how to adapt their legacy system of dealerships and service centers. Cadillac is maybe a little more forward thinking in that they already asked their global dealerships to plan on adapting to an all EV Cadillac fleet or take a buyout and leave the franchise.
So I wouldn't say that OnStar is "very costly" if all you care about is remote diagnostics for warranty purposes.
Even after OnStar sub expires, they only stop with the customer-facing notifications. GM still gets all your vehicle data.