The phantom union event has ended. Here's some data:
highscore ultimate 1 (=2362 pp), rank 968
highscore pp 2362, rank 3870
highscore pp 20399386, rank 675
highscore pp 72896035, rank 263

Dreamlitz posted these on Discord:
Union highscore pp 5, rank 1005
highscore pp 5, rank 4064