We already have laws against breaking into systems bypassing authorization systems. If they applied they'd be applied here. But they don't. Because in this situation we're talking about public websites and corporations being made you don't run their javascript.

As an aside, I do host a website from my desktop computer at home and you are free to access it! It's public. I intentionally put it on the public internet. I do not use a smart phone or the internet via phone.