Health insurance is regulated way beyond what you would expect. At least for the individual market, many plans are standardized across all carriers as mandated

Health insurance is regulated way beyond what you would expect. At least for the individual market, many plans are standardized across all carriers as mandated by the ACA. And in New York (if not elsewhere), rates are proposed in advance to the state and either approved or rejected (and forced to adjust), which can happen for being too high or too low compared to other players. The rates are then set for the year. This is not something subject to real-time bidding.