You're conflating MitM, which is specifically defined as an attack, with the concept of a middleman. You acknowledge that it's not an attack, even:

It just means it's not a man-in-the-middle attack.

The other things you're describing are also framed specifically in a way that makes Cloudflare seem like some sort of bad actor out of the norm.

You say users have no choice in using Cloudflare. Yeah, the party that runs the service/website/whatever decides what services they use to serve their content. Nothing special there. If you are against Amazon then users have no choice but to use them when the other side chooses to use their services, or any other service provider which includes the ones you like. Similarly, users would have to resolve DNS records to determine what services they are connecting to.

You also don't have to use Cloudflare's proxy. You can just use them for DNS record management. You can use different SSL settings that allow an unencrypted connection between Cloudflare and the server, or you can enforce strict SSL policies where it is encrypted end-to-end.

You're going to have to prove any of your claims, or else I am just going to assume you're talking out of your ass. Particularly because you're clearly misunderstanding what a MitM is, or you're intentionally misusing it.

-edited formatting-