Tailscale only allows you to create a new account by signing in with Google, Microsoft or GitHub. It's a real shame because it's a great service otherwise, but this left a very sour taste.
These VPN services have little to do with the traditional meaning of a VPN. They don't provide a private network at all, they just use VPN tech to implement a proxy service.
Tailscale is not a "VPN service" in that sense, they actually provide software for setting up a VPN between computers you control.
Don't feed the trolls.
That does make things harder for small shops where things are more ad-hoc, or an individual hobbyist who wants to use it. But not sure how much of Tailscale's market consists of people like that, or if Tailscale even cares that much about that segment. No judgment if they don't; that's a perfectly reasonable decision to make.