Canada

Secured against unauthorized remote access any better - very likely. Secured data against unauthorized access, probably. But Jeep is authorized. The broader important point is that there's no fundamental difference between the computer system shipped in that 2015 Jeep and today's Jeep. There's vehicle LAN network in addition to the CAN network. There's usually several computers on it talking to each other, with access to the internet and Jeep's servers (through a cell modem). There's typically a central computer that does core function, infotainment computer that drives the centre display, an ADAS computer that does driver assist. There could be more. Today they have faster CPUs, more RAM and more storage than in 2015. Think evolution of smartphone SoCs as they're typically related. Depending on the manufacturer and model, they could be combined into fewer or spread to more computers. Also depending on the manufacturer they collect and send different amounts of data. The overarching incentive is that data collection is profitable so every manufacturer has to contend with that and oppose it to what they're allowed to do. Pretty sure you know how competition for profit maximization works. You probably have to go back to early 2010s models to find ICE vehicles without these computers.