Also ich würde behaupten, dass es in der Tat nicht sehr cool ist einfach in einer anderen Sprache zu antworten.

You probably have a skewed impression. This is common in some places like Germany, but it’s far from the norm. (Even in Germany it’s mostly telecom that does it for some reason.)

Many ISPs only change the allocated IP only in cases like lost connections and some don’t even do that giving out but not guaranteeing static IPs.