device discrimination?

“ You’ve used 100%of smartphone mobile hotspot high speed data on your T mobile plan, your smartphone mobile hotspot speed will now be limited to 600 kbps until 10/12/2023. Data on your smartphone will still be at full speeds” This is the message sent to me by T mobile on my phone as a text. Now, tell me that they don't choose what device to throttle down, if you will, please?

A few years back, I bought a "hotspot mobile device" that also came with unlimited high speed mobile connection via WIFI for a annual (12 months of service at a time) set price, but the "catch" was that they were unable to guarantee that the buyer would receive the entire twelve months of service, as they were unsure going in that the laws at that time would allow them to sell their allotted bandwidth, as it was subcontracted from a major carrier. Sure enough, congress passed a law making that impossible to do, it was too good for the customer and not the business or something. I received 10.5 months of really good internet using this rechargeable mobile hotspot, and since then no carrier has been able to repeat this offering. I was a AT&T customer since it was southwestern bell, and near the end they were abominable in their contract, as there was no way to ever get rid of the $10 monthly equipment fee, because someone at the FCC was getting paid off to enable them to basically charge you thousands $$ (over time) for a device (cheap modem) you could buy used on eBay for $10 - $20, and if you didn't turn it in when you ended your service they could tack on a "penalty" costing you a couple $$ hundred more. I'm convinced that if you are mobile, and need 100 Gig of mobile high speed data to use on a laptop, there is no way you are going to achieve that for less than $100 month, from anyone. The big three carriers sue any up and coming business that tries to get under that $100 monthly threshold in America, and there is no way around it.