There are subsidies in a handful of cities and states in the US (https://ridereview.com/incentives/country/united-states), and there are bills for a federal subsidy with a decent amount of support in the House (https://www.congress.gov/bill/118th-congress/house-bill/1685) and Senate (https://www.congress.gov/bill/118th-congress/senate-bill/881).

Also, shoutout to Vienna which has the coolest program I've heard of: businesses get subsidies for cargo e-bikes, and in return they loan them out to citizens for free. So if you've got a bunch of stuff to haul, you can borrow a cargo bike for free and use their incredibly good bike network to move your stuff. English summary: https://smartcity.wien.gv.at/en/approach/smart-city-made-sim....