There's different internal network configs (APNs), and hotspot uses a different one than regular mobile data. ( or at least it used to). Those can be configured and metered separately from the carrier's end.
LineageOS, and maybe some other custom ROMs, wouldn't do that and would put the hotspot and mobile data on the same APN to get around that.
Back when they just began recognizing it, they noted peculiar traffic. Desktop websites, batch downloads normally unavailable to that system. This assumes that you utilized the internal hotspot system and didn’t create a separate one. Now? Not sure whether their system is more robust but it should, theoretically, be possible to obfuscate your traffic using third party hotspot software. No clue where to look for that anymore.
I used to routinely use 100gb of data on my jailbroken sprint iPhone. Did that for almost 3 years. Never heard a peep from them. But this was forever ago.
If you used the package I think you did, that’s not unusual. Absolutely will not remember the name but there were numerous tweaks that just flipped the hotspot switch but a couple that allowed you to use a hotspot without directly using the inbuilt function. One was free and broadly used.
Yeah, installing a new OS on a phone isn't something you do easily like on a PC.
You have to unlock the bootloader, which requires an unlock code from the manufacturer, then you have to factory reset it, and that's even if your phone/carrier allows it. Many don't (which is why it's so hard for me to replace my phone...grrr).
So yeah, installing a new OS on your phone is typically going to require quite a bit of effort and some level of commitment as well as a device that's bootloader unlockable and supported by an alternate OS (each device and model requires a custom build).
It's....a whole thing. It really shouldn't be, but it is :(
Yeah, my old Moto Play G4 was a breeze. Wasn't quite "Press any key to continue" but not much more difficult.
My OnePlus was a little more work, but that was mostly because of the OP website acting up and refusing to generate my bootloader unlock key. Also had to do things differently since it didn't have an SD card to hold my install stuff like the Moto Play did.
I had one where you could literally run an app on the phone, no ADB or anything. Can't remember what phone it was now but it might've actually been a Moto Droid
One one hand, that sounds extremely convenient. On the other, I shudder thinking what a malicious app could do with that 😆
Edit: Unless you're talking about doing it through TWRP. I had to flash that over fastboot, but once installed to the recovery partition, I could boot into that and install the rest of Lineage and extra packages straight from the SD card. Updating the system was just downloading the new Lineage .zip to the SD card, booting into TWRP, and clicking install.
negotiate. i called my last carrier from my new carriers retail store front. they practically begged me to stay and said they'd give me everything i asked for.