1 in 4? That is insanely high. I would be surprised in 1 in 10 can explain what NN is properly (not "evil ISPs are gonna to make us pay for pr0n!") and about 1 in a 100 to explain what actually happened in 2015 and what happened in 2018 and what is the state of current legislation around ISP-content provider relationships. These things are complex patchwork of years of legislation and require non-trivial knowledge to understand. I rate the chance of 1 in 4 of Americans having this knowledge as the chance 1 in 4 Americans can fluently speak ancient Sumerian.