On February 1st 2024, AWS will start charging for IPv4 addresses. This will cost $0.005 per hour -- around $4 month
This is a very nice idea, and finally happening on a global scale.
Hetzner started charging IPv4 addresses (or rather, allowing a discount if you do without: the total price is the same it was before) since a few years and I guess that's working fine for them.
like this