The cases are very interesting. In the 2nd case, the court used the fact that the older guy exploited the teenaged girl's drug addiction to exchange sex for drugs and $$$ to establish an "exploitative relationship" with "influence and control".
Gaetz is not 50 years old. However, if the girl is dependent on him for $$$, it could also set up the exploitation offence if it happened here in Canada. I'm not sure that simply buying the girl stuff would necessarily do it, if the girl was financially independent - i.e. had parents who were paying for her. But how likely would that be?