If the value then drops 10x, you won’t get your property tax refunded. If prices end up going up and down like bitcoin, you’d need to have some protection.
> If the value then drops 10x, you won’t get your property tax refunded.
That's right. And why would it?
But also: your example is imaginary. When was the last time that house values dropped 10x or even 5x? It's counterproductive to make tax policy based on the extreme cases that have never happened.