Why are all American Pie films except Netflix for the first time?
Probably someone at Netflix thought they should be there.
Yes, but where's the first one?
So, your question is, why isn't the first of these films on Netflix?
Yes
Perhaps it is at Amazon Prime Video or Maxdome.
Well, according to an internet tip on Netflix, it's probably not in your region.
https://germany.flixlist.co/titles/22037751
Netflix is an extremely unreliable platform when it comes to the offer.
Netflix does not purchase licenses for charity only. The goal is the largest audience in relation to the license costs. Part 1 is probably just too expensive.