When I purchased my 2022 Chevy truck, I refused to subscribe to the OnStar network and the XM-radio network that the salesman offered during the final checkout after the sale. He was flabbergasted. Why would anyone not want those services? I told him that the new truck was my backup for when my 2002 TrailBlazer died (which IMO is the finest vehicle that GM has ever produced). He was not impressed but finally gave up on the sales pitch.
I, too, have a 2002 Blazer. How many miles on yours?