There is no Porn Big Tech big enough to be able to afford this legislation. From the article:

As recently as May, only a quarter of people trying to access Ford’s site even clicked the link to verify their age and only 9 percent of those users completed the process. Ford said it costs his company around $1.50 per person to verify their age, and there’s no promise that those who follow through will buy anything. Pornhub’s response has been far more aggressive, blocking all traffic from some of these restrictive states rather than paying the extra cost.

Remember it is part of the GOP's published plan for 2024 and beyond to ban pornography.