> The company is offering a 20% discount that you can apply toward one of its new Kindle models, Federal is complicated right now, but can state AGs step in, and make Amazon either continue to support the old devices, or provide comparable free replacement devices?
Can they, yes. Just about anyone can be used for just about anything. Should they, no. Why should Amazon continuously support, checks notes... 14 year old devices??? Likely the number of customers using a device like that anymore is super small.
Unless you can find where the original advertisements (not microscopic fine print) said that the company would disable the network service side after a period of time, such that the buyers knew that's what they were buying, then the company is obligated to continue operating the service they sold. Or negotiate some alternative satisfactory to the buyer.