It's interesting, because quite a lot of the pornography ID laws are passed by Republicans and popular among Republicans. I don't mean this as a "both sides" sort of argument, but rather that modern tech seems to be unpopular among all constituents, even if different groups have their preferred villain.
I feel like those laws are different because they specifically target pornography, which is seen as an evangelical moral sin. They would prefer to ban it completely, but that most likely runs afoul of the Constitution. So their next best bet is just to try to limit it to over-18s.
Obviously the end result is the same, but I think the motivation is different.
They dont care about constitution. And they are in position to reinterpret it however they want to, regardless of its text and meaning.