Why the manufacturers push it

• realtime traffic updates - subscription revenue
• live charger status - subscription revenue
• streaming entertainment - subscription revenue
• software updates - remove features, introduce bugs or send advertising so you buy a new car
• emergency crash response - mandatory by law in eu
• Wi-Fi hotspot - subscription revenue
• Remote alarm status and controls - subscription revenue
• remote telematics - they sell it (the user manual for the seat mii explicitly says that)