How about the common sense thing? It's the parents' job to monitor their kid's internet activities. If you give your kid unfettered access to the internet on their phone of computer than you should be held liable for the results. If your kid lets their friends access porn on those insecure devices that too is your fault. If their school fails to lock down their network to block inappropriate material then that school should be held liable.
The current Texas law puts every adult user's privacy at risk rather than holding the parents responsible for their own failures. In addition, it's written so broadly that it would quickly be used against any site the Texas Republicans choose to target in their culture wars such as sex-ed and LGBTQ+ education sites.