Fidelity used to be known for actively managed funds, but has been eating Vanguard's indexing lunch for the past 10 years or so. Part of this relates to its dominance in workplace accounts, but Vanguard hasn't helped itself with some bad customer-facing software updates and a perception that its service levels are poor compared to Fidelity.
Cutting fees helps, but Fidelity has shown its willing to do this, too, including no fee "Zero" index funds: https://www.fidelity.com/mutual-funds/investing-ideas/index-... (note Fidelity is very clear about who it's competing with)