Neither IMDb, nor Rotten Tomatos, Trailer Addict, or TrailerList provided what I was looking for. Too much "by-catch", too selective, too hidden, too abandonded.
So I picked the idea up again for my own trailer source. And as I always try to learn some new technology with my side projects, I started to look at automation. IFTTT, Microsoft Flow, and Zapier, here I come.