I was really concerned about it at the time, I admit, but now seems overblown in retrospect. Internet speeds, for example, have only improved since then. And haven't seen the concerns about web site bundling or priority access manifest.
ATT appears to have a transparent proxy [1] on LTE that selectively disables protocols based on usage. As a rural LTE user, we completely lost our ability to work/school from home for 2 weeks as a result until I could find a suitable alternative. Note, there was no violation of TOS or anything like that.
[1] - https://forums.att.com/conversations/other-phones-devices/at...
How would you know? Absolute blocks are one thing, artificial performance differences another. If your ISP was slightly reducing the performance of one streaming service to advantage another, how many people would actually test for this? If a phone maker (apple/google/whatever) was feeding an ISP money to ensure their phones would be that little bit better on the network, wouldn't most people chalk that up to differences in hardware? True evil survives by being difficult to detect with certainty.
If you have one of those ISPs and Netflix, then you're paying your ISP twice: directly for the internet connection, and indirectly for the privilege of being able to use Netflix. This was literally the argument in support Net Neutrality, which ISPs said would never happen. It only took months for ISPs to capitalize.
They have even had to ration internet during COVID https://www.telegraph.co.uk/technology/2020/03/19/internet-u...
Although I despise our internet oligopoly in the US, in the EU it seems to be even worse despite their heavy handed regulation.
Edit: although if the EU requests to slow down data were totally unnecessarily it certainly doesn't disprove your point about excessive regulation