The store came to be as an “f you” to Apple, as evident from the email exchanges at the time. The 1984 trailer from Fortnite seemed to be in the same vein. I don’t think that particular trailer was for the purpose of promoting the EGS, as there’s not a single hint to the store in the video or its standard placement.
One was a jury trial and the other wasn’t. Google had plenty of records of their internal communications but Apple had a different practice. This article by The Verge does a decent job at highlighting the differences.