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So is zrok - https://zrok.io/. Also fully open source, can self-host and has an option for 'private share'.

Not quite the same thing. Setting up a Tailscale network and installing/running the VPN client on your laptop takes an order of magnitude more work and system access than just running a script to open a local HTTP port (which is how ngrok, pgrok, Cloudflare Tunnels etc operate). The use cases are very different.

running tailscaled agent in proxy mode requires significantly less "installation" than installing the full tailscale "VPN" experience.

sure, it could be streamlined even more (currently it requires that you run "tailscaled -tun userspace-networking", possibly with a custom unix domain socket path, and then also run "tailscale up" to activate it)

also, for a lot of use cases (eg accessing your home-hosted stuff, on the go) simply tailscale, even without funnel, is fine

funnel is still in alpha stage, you have to join the waitlist to be added to the testers, could take a long time…

There is an invite code on a public tweet by bradfitz:

https://twitter.com/bradfitz/status/1593767530082226176