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Novel attack against virtually all VPN apps neuters their entire purpose
(arstechnica.com)
This is a most excellent place for technology news and articles.
You can also use network namespaces on Linux which Wireguard has a nice explanation and walkthrough on, recommending this as part of setting up wg connections. https://www.wireguard.com/netns/
I saw that but unfortunately it doesn't detail how to set it up persistently on every boot. And I also haven't seen anybody using this method, probably because of the lack of tooling around it. For example afaik the official Mullvad client on linux just uses a firewall.