T-Mobile-YouTube incorrectly throttles 1080p high bandwidth videos on youtube.com in the web browser for ALL T-Mobile customers

I have the T-Mobile One Simply Prepaid 10 GB 4G LTE plan with Data Maximizer turned off.

As T-Mobile website states in the URL below you get up to 10GB 4G LTE whether you use the cell phone or tethered computer.

https://s3-us-west-2.amazonaws.com/images.rebellion.prod/General/Prepaid/marketing/Compare-plans_V4.pdf

I get download speeds late at night at 100mbps and even when I was on the call with the Office of the President this afternoon Ookla speedtest was over 50 down.

No issues downloading or uploading huge files on Google Drive - the 4G LTE speed is great.

How this started was when I filed a FCC complaint because when tethering I couldn't watch 1080p video on Vimeo, Youtube, on my tethered desktop.

See how the .pdf lists in fine print "You may deactivate Data Maximizer on some plans (e.g. Simply Prepaid) to allow on-device video to stream at speeds that provide HD video capability (max 1080p); tethering optimized." - I wondered if that meant I couldn't watch 1080p video while tethering at all.

I don't know if they modified my account but I can watch Vimeo 1080p video fine while tethered but high bandwidth (over 1.5 mbps) VEVO music videos don't play at all in the web browser regardless of cell phone or tethered computer so something is going on.  YouTube app on phone works fine so some coding issue is happening.

This happens even when I do my test at 3AM late at night with the web browser with VEVO music videos.

Even in the local T-Mobile store the Office of the President had me go to I went to a display model (Samsung Galaxy S10+) and didn't put my sim card in and it still wouldn't play.

Can there really be congestion at 3AM in the morning even though Vimeo and Vudu work fine and I can download huge files at 100mbps?

Check out the T-Mobile reddit thread too -- users are chiming in - many see the same problem on postpaid T-Mobile One Plus