Hey there! Tailscalar here, I'm a member of our Product team. We're working on how we evolve the Services pricing model, we know it's not exactly right at the moment. We don't intend to suddenly start enforcing a hard limit on folks who have been early users of the Services feature.
no worries :). I plan on remaining on personal plus anyway until such time as you stop letting me give you money (making this the second plan you'll have kicked me off of :P), but there's not actually any difference between the (now) state of that and the free plan as far as I can tell. (also is the plural of Tailscalar Tailvector?)