So, the Americans do have some problems with monopolies in their ISP market.
But, Net Neutrality wasn't the right solution to these problems (in my opinion).
For example, I don't believe we need Net Neutrality regulations in South Africa at all.
As far a I know, consumer protection legislation is a bit lacking in the U.S. (for all other markets they seem to think that a free market is the solution) which would address most complaints, such as hidden fees, undocumented limits, early contract termination fees etc.
The only regulations they need are to require last-mile infrastructure owners with significant market share (e.g. more than 25% in a county) to provide wholesale services (e.g. something like IP Comnect or IP Stream) to any ISP who satisfies reasonable conditions.
Please provide an example that a reasonable implemenation of Net Neutrality would solve that a combination on consumer protection regulations, requirements to provide network access to other ISPs, and existing anti-competition prevention law would not solve.
Internet providers have attempted to throttle traffic by type or by user (Comcast in 2007),
Here, the biggest complaint was that shaping of p2p was not disclosed, and the whole complaint was successfully addressed before Net Neutrality regulations.
have imposed arbitrary and secret caps on data (AT&T 2011-2014),
This one is about users who took the unlimited data at 1Mbps on iPhone 3G and complained that they were throttled to 512kbps after using lots of data at LTE speeds (on a plan that was grandfathered and never sold for LTE).
While they could have gone about it a different way, it really isn't reasonable to expect an unlimited product you bought at 1Mbps be unlimited at 50Mbps.
But, again, this was dealt with without Et Neutrality regulations.
hidden fees that had no justification or documentation (Comcast in 2016),
Consumer protection laws cover this for many industries/markets (at least in South Africa, if the U.S. doesn't have adequate consumet protections, that would be a better thing to fix).
and tried to give technical advantages to their own services over those of competitors (AT&T in 2016).
So, this questionable practice occurred while Net Neutralty regulations were in effect (if I have it right).
These attempts were only revealed in retrospect once they were discovered and lawsuits filed. If the deterrents those lawsuits provided eventually had been part of preemptive rulemaking then these practices would never have been attempted at all.
Of the 3 examples provided, 2 were dealt with regardless of Net Neutrality regulations, and the 3rd was not prevented by Net Neutrality regulations, as you claim it should have been.