It is curious that there's no reported disgenic effect though - that seems counter to evolutionary theory? Perhaps it's only limiting the rate of growth of IQ/intelligence.
There's a classic sci-fi story in which we rely on computers, the population gets dumber to the point noone knows how to make/fix the computers. I think in that there's a computer glitch that then wipes out humanity; but it's from the time when there were monolithic computers.
https://en.wikipedia.org/wiki/Fertility_and_intelligence - it says 'fertility' but I think it means fecundity/actual reproduction