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You need your phone's hotspot to perform NAT and DHCP. Android devices used to do this by default, until the mobile networks bullied Google into changing the defaults so that devices connected to the hotspot were essentially joining your provider's network.
Easy to fix on rooted devices.
They also inspect the traffic; we used to be able to stream Amazon Video to our hearts' content on a Linux laptop tethered to an Android phone with a 3 SIM, whilst trying to browse on a Windows laptop would redirect to the "Your package doesn't include tethering" page. They learnt to detect Linux laptops about a year ago. Not sure if this was by looking at the user agent string sent by the browser, but we're not reliant on tethering at home any more.
On my moto play, is there any way to trick the phone to think it's not on hotspot?
I've got unlimited data, but only 30gb on hotspot.