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Well, WireGuard and WebRTC, but yes.

The real feature of Tailscale is being able to connect to devices without worrying about where they are.

There's no WebRTC in Tailscale.

Isnt a derp server juat webrtc with minor changes?

You don't need the whole of WebRTC for NAT traversal, TURN/STUN will do the job.

You might be confusing it with netbird, which is the 601st implementation of a mesh network that does use both WebRTC and WireGuard.

Edit: apparently it uses STUN/TURN but not WebRTC

Nat punch is a big part of it, but so is key management/sync, and configuration management.

...and DNS, and host provisioning, and SSO, and RBAC, and other stuff you need to sell to enterprises.

tailscale is a wrapper around wireguard in the same way that dropbox is a wrapper around rsync