In defense of Yata, her cards are varied and while not objectively the best, quite decent.
And... we are humans, each one of us have a different reaction to adversity.
She can chose to ban anyone she wants as much as we can chose to steal all her cards as much as we can.
Living beings compete, the weak are eliminated.
Precisely because everyone competes in this world, facing off with their respective strengths and trump cards, can history be so immense and interesting, making the world such a mystical place.
The Great Dao is emotionless and impartial.
Every living being has the chance to rise up, it depends on how one uses their opportunities, and how one fights!