You can get a USB-C charging brick from Amazon for $10. That's assuming you don't have a spare cable and brick laying around after nearly a decade of them being included with every iPhone and iPad. Most people do have something. Those 2 billion charging bricks and cables have to be somewhere and they're not just in the drawers of Apple enthusiasts on MacRumors.
However, people are obviously right that Apple is making more money from this by not including them. That's just a fact no matter how much it might be. It's also a fact that these phones will be a lot greener by not including the bricks and headphones. Something can be two things at once.
I for one am fine with Apple making a little extra money if it means that the equivalent of 450,000 cars worth of emissions are not put into the atmosphere. The world needs to change and companies need to change. The way we save our planet is, in part, by companies figuring out how to profit off of saving the planet.