Why did Fidelity drop Fisher Investments?

Could you elaborate on the reasons behind Fidelity's decision to drop Fisher Investments? Were there any specific factors that led to this move, such as performance issues, differences in investment strategies, or any other factors that may have contributed to the decision? How might this change impact Fidelity's clients and the overall investment landscape? Is this a sign of broader changes in the financial industry, or simply a one-off decision?