I just got an email about this and here’s what they say: > Your plan is unaffected and you can continue to use the Personal Pro plan as you normally do. However, Tailscale's new Free plan includes nearly everything that Tailscale has to offer for up to 3 users on a custom domain and 100 devices. This plan may be more aligned with how you use Tailscale. Go to the Billing page in the admin console to review your option…
So if you didn't need those, you save money now, but if you do, you have to pay up to get the same features (going from $50/year up to $200+/year if you are just using it alone). So it's not all pure altruism.
But I'm not a Tailscale user, this is just from what I see looking from outside.