I’m in the states and just use Private Internet Access in conjunction with qBitTorrent. You can make qBitTorrent use the PIA virtual network interface only. I believe PIA also has a kill switch to keep data from bypassing the VPN. I will say that I have never setup port forwarding for my VPNs. I have port forwarding setup for other hosting services I have, but PIA was a one stop shop for me and I haven’t had an issue with their service for 2+ years. Unsure about how it does with streaming!
I would much rather a car manufacturer focus on making sure the hardware is nice to use rather than coming out with some Ass-software that they came up with in house. Also, I’m going to connect my phone to the radio anyways so why reinvent software to make it less compatible then the native software my phone manufacturer has already R&D’ed pretty well. I assume there is some licensing bullshit with either CarPlay or Android Auto that could be playing a factor. But I would still rather the manufacturer focus on a nice feeling, high refresh rate, bright display rather than focus on some new clunky interface they develop.