Comment by iscoelho

Tailscale's netstack is barely even WireGuard and they aren't compatible whatsoever. It's all marketing at this point.

So it's not that simple: it's impossible for Tailscale to use any existing kernel or accelerated WireGuard implementation. They could derive inspiration, but a kernel module for Linux won't fix Windows & Mac. With that said, I feel they have enough funding to maintain a few platforms (: