It is possible. Maybe the peering from his ISP to YouTube is shit/ overloaded. That was an issue for Deutsche Telekom for a few years because Telekom didn’t want to pay for better peering. With a VPN it is possible to get good peering to your ISP and YouTube and in return faster load speeds.
Likely just a network-related issue
Using a VPN on a shitty network won’t magically make your network connection better.
It is possible. Maybe the peering from his ISP to YouTube is shit/ overloaded. That was an issue for Deutsche Telekom for a few years because Telekom didn’t want to pay for better peering. With a VPN it is possible to get good peering to your ISP and YouTube and in return faster load speeds.
Well crap, I didn’t consider that, thanks!
No but it can definitely work around issues like a congested link between isp and Google, resolving network-related YouTube performance issues.
No, but it does affect what route your traffic goes through.