This is not a very thoughtful way to declare speed limit signs "pointless".
If "pointless" can't be defined by an effort to curtail a "prohibited behavior" in which 90% of the population engages in almost daily due to us creating all of the incentives and opportunity to do, and in which there's only a 0.08% success rate of actually detecting and enforcing it, then I don't know what does.
We've intentionally designed and marketed cars to go well over 75mph... even the base level "soccer mom van" will do 80mph+ if you put the pedal down. We've developed numerous tools like radar detectors and Google Maps/Apple Maps/Waze which all tell you where the cops are hiding.
And then say "Gee, how do we get people to keep it to 65mph or less??"
Same is true with the internet...
We've designed a system that's the "world wide web"...the intention being that we can get to websites everywhere in the world, developed privacy tools and anonymizing tools specifically with the intention of keeping eyes (including that of world governments) out of what people are doing on there. And then loaded it up with ton of a particular type of content that people like to look at (whether they admit it, or embarrassed about it, or otherwise)
And then 20 years later, asked the question "Gee, how do we put some guardrails on this?"
Both are examples of issues that could be described as "We let it get so far away from us, that now the only way to even have a chance of reigning it in would be via measures that are draconian"
To use another topic as an example:
Gun control...
What's easier? Having control measures right from the get-go before 200 million people have built their own private arsenal?
Or letting them all get them first, and then trying to find some sort of way to get them back from people after the fact?
What if recording was only engaged when speeding hit a certain threshold?
Nope... I work in the tech field, bugs can and do occur.
That would create the same kinds of risks.