bro if you use mobile hotspot then it is just taking internet from your mobile data only so if you set data limit to mobile it will limit mobile hotspot too. if you satisfied with my comment then accept my solution by clicking three dots
I recently switched from a Huawei device to Samsung, and so far I think that only Huawei devices has that feature. Fingers crossed one ui 4 includes a Hotspot limiter and the ability to disable data usage completely for various apps because the current one is weak, unlike Huawei which was more thorough in that regard.
I can attest to that, huawei devices are smart in that regard, you can't limit devices that can connect and you can also set the exact dates they'll use once they connect. In huawei you can also set the notification bar to show you the internet speed.
That seems like it's not really answering the question, though. On other phones (for example Huawei), you can limit hotspot data usage without limiting mobile data usage in general. Seems like a pretty useful feature to me, and imo that's what OP asked for.
