Banks can and will close your account for any reason under the Sun. How do you write a check or receive one without a bank account? I'm not familiar enough with

Banks can and will close your account for any reason under the Sun. How do you write a check or receive one without a bank account? I'm not familiar enough with money orders, but I assume the same applies. Then, on top of all of that, you can't run a business through a personal account. So you still require a business type bank account, and the above options are terrible for any eCommerce site, which is pretty much the only kind of business that will be discussed here on HN.