Capital. Supply chain (inputs). Distribution chain (sales). Familiarity (brand awareness). Interoperability (ancillary equipment, PTO connections, fittings, etc.)

Market position and power takes time to be established. It takes time to shift. Even under extreme negative pressure (that is, "loyalty" is due far more to lack of alternatives than genuine delight or satisfaction) collapse can be a long time coming.

And that's before anticompetitive pressures are brought to bear (e.g., exclusive contracts or threats of retaliation against any of the above).