It's not about misinformation. It is about not being allowed to do business because of affiliation with a sanctioned entity, and playing the freedom of speech card does not give you a pass in this matter.
If the site is selling something, and the visitor buys something, then the visitor is "doing business". Reading text that is published at zero charge isn't "doing business".
At the ISP level, it is even clearer than at the individual level. The ISP is passing traffic through from an entity, based on a business relationship, either direct or transitive, with that entity.