Does the law say that’s OK?
If not, the driver is still in the wrong.
That not really how it works though. Laws and morals do not perfectly align even in mostly civilised countries like the UK.
More importantly, laws are written under the tacit assumption that they won't be perfectly enforced. Have you ever driven 31 mph in a 30 mph zone? Illegal! You're in the wrong!
I have never watched his videos so I don't know what proportion of his videos are of people stopped at lights briefly looking at their phone... but I don't think many people (even cyclists) would seriously object to that.
I both cycle and drive a lot. There are a lot of bad drivers that I wish would get snitched. But I also occasionally look at my phone while waiting at a red light.
It's trivial to find laws that the majority of Hacker News posters (and you) find abhorrent. Do you really equate law with moral correctness?