Not by today's standards no, but this was the 1500s. They saw casting the horoscope of the royals in the same way that we would view someone now who had inside

Not by today's standards no, but this was the 1500s. They saw casting the horoscope of the royals in the same way that we would view someone now who had inside knowledge of (say) a major development project in some part of a city and who used that inside knowledge to buy land cheap in order to speculate.