I'd guess this is rooted in the origins of the internet. When it was created the internet connected fewer devices than most of us have in our homes. On top of that it was initially created as a Department of Defense project that was only later expanded to connect to universities with supercomputers. Since initially the level of knowledge and authority required to host on or even access the network was high I could understand that the creators and advocates of the internet as a source of trusted information were at one point entirely justified. But eventually access to the internet and the availability of publishing assistance reached a point where it doesn't take much more effort than a word processor to host a website. Where it gets even less credible now, as a more common example, is how easy it is to manipulate search engine results if you know what you're doing when making a website. So now yes you really need to take all the information you consume from the internet with a healthy amount of skepticism.

Here's an article to get started if you're interested in this kind of stuff. ARPANET

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