I don't think there is any explicit shaping / throttling happening on US wireline networks these days. There was a huge blowback against Comcast for trying tha

I don't think there is any explicit shaping / throttling happening on US wireline networks these days. There was a huge blowback against Comcast for trying that ~10 years ago, using Sandvine gear to throttle bittorrent traffic at peak times. There is still plenty of implicit throttling going on though, with broadband providers refusing to provision enough capacity between their networks and the content source networks. The existing links then become congested at peak times and performance is degraded for the customers trying to access that content. VPNs may improve performance in this situation not because they are hiding or disguising the content, but simply because the traffic is "re-routed" around the congested links. Assuming that the links from content network -> VPN host and VPN host -> end user are not also congested.