User blog comment:Mira Laime/Update on our plans to bring Gamepedia and Fandom together/@comment-64.111.36.62-20190306010741/@comment-24006128-20190306011059

Unearthed Arcana is not covered by the Open Gaming License, unlike the Basic Rules and SRD. You are correct that it is not paid content, but it also cannot be reproduced.

The people who run the 5e wiki are having their questions answered. They have a direct line to me whenever they have a question.

Additionally, the dnd5e wiki decision was unrelated to Project Crossover.