[fhrow4484]

Another caveat of that app, even though the website hides it pretty far in the T&C, is that it appears to be owned by "Verivox GmbH" : https://de.m.wikipedia.org/wiki/Verivox

Translated to English the Wikipedia page says: "Verivox is a company that compares tariffs for telecom, electricity, gas, insurance, finance, vehicles, and commission-free real estate and brokers contracts for these services"

So they're using consumers to do their jobs, which probably harms consumers in long run by preventing a healthy competition amongst those services.