HubSpot meeting links are perpetual: it seems whoever has one, they can reuse that link however many times they want to book more meetings with us.
It might be worthwhile to be able to generate a link that only allows the booking of one meeting - be it just one at all, or perhaps more conveniently, one for a single booker email ID.
I've come across this as a recipient in one of the other online bookers and it makes sense.