There are absolutely incentives - tax credits and rebates - for buying electric bikes in some areas. My state is offering $500 off any ebike purchase.
The auto industry is not being subsidized by consumer incentives. The auto industry is being subsidized by tax credits whenever they build a new facility, which is still arguably dumb. Consumer incentives are designed to get the average citizen to buy an EV over an ICE vehicle. The consumer is gonna buy a car anyway - someone in the market for a car isn’t going to buy a bike, even an ebike, based off of price. They’re buying a mode of transportation based off of lifestyle. Many simply can’t commute to work via bike or public transportation, and if a credit gets them to buy an EV over an ICE vehicle, this is a net benefit.
The solution to public transportation is not to attempt to disincentivize or punish car drivers, then build mass transit. Gotta build the mass transit first. The financial incentives for people taking mass transit are the fact that the most expensive mass transit in the US costs ~$1,500/year. The cost of owning an operating the average car in the US is ~$10,700/year. Yes, build more mass transit to free us from being slaved to expensive automobiles! But until then, preventing incentives for greener vehicles that would be purchased by those who have no choice is just shooting yourself in the foot.