Okay, if it isn't a back door then why don't you hop onto a plane right now, fly direct to the USA and go have a chat with USA immigration? I'm sure they will let you swan in with your arguments.
Oh wait, you can't.
(and the whole privilege of 'well we can go fly to another country to 14 days if we want to then fly to WDW to get around the rules' is just grim. Families/couples/solo travellers who have saved for years have had holidays to WDW cancelled and due to the changes, removal of so many benefits and the price increases of bloody Bob PayChek (and no doubt Bob Iger before him), are now unable to re-book their cancelled trips due to being priced out. So yeah, it leaves a bad taste.)
I genuinely don't get why people keep calling it 'sneaking in' or 'backdoor' there are clear rules.
Saying why don't you hop on a flight direct and speak to them, then saying you can't. Correct. You can't fly direct.
However its all about risk.
If someone can and wants to fly to a country on a green list.
Spend the 14 days there.
Follow procedures needed to travel on.
Then go onto another country, and return. And that the country you return from allows this as a valid route.
Then there is no problem. If they want to risk getting stranded, want to risk getting ill, want to risk high cases then that's on them. I said before I would do it. I would, not right now as cases are too high in Florida. But if they weren't I would.
I'm not a fan of Get Binky, Yaz and Cash etc or any others rumoured to be doing this. And while we all may not agree, technically they are not doing anything wrong. And not sneaking anywhere. Whether you personally feel morally its wrong is a whole other valid reason for you to feel that way. Don't try and throw the rules in as an argument though.