Stuck on this, Xbox controller connected, I've been approved for xcloud, I don't know what...

"I don't know what Bluetooth is."

Bluetooth is a wireless technology, it allows you to connect Bluetooth enabled devices to other devices to allow them to be used via wireless, in this instance an Xbox One controller on mobile phone or tablet.

to use an Xbox controller on your phone you'll need to sync it to your device.

As for it being some kind of Scam, it isn't. I've not been able to test home streaming on a phone/tablet, but I've tested out the Xcloud preview and I'm pleasantly surprised!

Just because it didn't work for you or you don't understand how to set it up, doesn't make it scam.

What could it be used for? Imagine being in hotel with a fast internet connection but you've got nothing to do? Xcloud to the rescue. Connect your controller to the Phone or tablet and stream Xbox games to your device. Seems pretty cool.

I see, don't know exactly what might have been causing this delay on the series X controller on the Xcloud. By any chance, have you tried the Xcloud on a Windows PC or android device, using your controller, just as a test?

xcloud is a great engineering thought

What is Project xCloud?
Project xCloud is the codename given to Microsoft's forthcoming cloud gaming platform that is planned to be a complementary service to its Xbox
One and forthcoming Project Scarlett games consoles.

It is a streaming service, in that all games will be hosted on remote servers and live gameplay video will be sent to a compatible device over the internet. In return, controller codes are sent in the other direction so, for all intents and purposes, it
feels like you are playing a game loaded on the device itself, whether it be a smart TV, PC, tablet or smartphone.

a type of gaming steaming service