IMHO they should be a good steward and toss the Wireguard guy a mil considering Tailscale is pretty much Wireguard with a GUI on top.
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It’s a bit like saying Dropbox is just a GUI on top of TLS.
What tailscale has over it is hype, lots and lots of hype. Also a much more well thought out, and arguably more secure VPN protocol underneath, which is why GP's comment is on point.
Polish costs effort and money and it also really truly saves time and makes for a better product. So that matters.