I can understand that it's easier to just select the biggest sources of traffic and throttle them, but that doesn't make it okay. The least they could do to show good faith is throttle their own service.
We ran into that issue with the marketing department and upper management when I work at a telco. We where starting to sell 3G USB modems, and "plan" was that we'd start to push internet via 3G, because it was 7Mbit at the time and that would be plenty fast. There would be no need to sell ADSL connections anymore.
The issue, which the people responsible for the network pointed out is that the 7Mbit was SHARED. It assumed that the user was alone on that tower. Also there's a limit on the connection to the tower it self, these are fiber now, so not a major issue, but a limiting factor at some point.
Internet via 4G is certainly faster than 7Mbit now, but it's still a shared capacity. If you surf the net, check your emails and such, it's in burst so it's fine to share. Streaming is you using a constant amount of traffic for a sustained period of time and that's not what the cell network is designed to do.
What do you want their marketing to actually say?
(Laws requiring clear advertising and disclosure are a great idea...)
That's reasonable but I don't see why this requires throttling specific services or types. By all means ensure that it's fair for everyone but maybe my file download is just as important as your email. Why should all file downloads be slowed down?
[1] https://www.t-mobile.com/offers/binge-on-streaming-video ('What is Optimized Streaming')
Note: that was a few years ago and I have no idea what’s changed. I gave up trying to deal with them.