Why create a site based on hating others’ hard work?
YouTube has spawned an era of content creation and consumption that has been unparalleled in society to date. Nearly anybody with a smartphone can now hit record, and publish content for anyone to view, easier than starting a website or blog even. Those wanting to tell their van build stories skew toward video content because they are often complex operations that are easier described in a video than with a series of photos and accompanying words. The deluge of content can be both bad and good, with no way for the viewer to differentiate.
YouTube only moderates socially offensive content, and people using poor practices or bad techniques are allowed to continue publishing. The few comments that rightfully call out bad practices and question the path the YouTuber took, are drowned out by those who are there the entertainment, and the situation gets worse the larger the channel. Content nowadays is valued not by how factually correct or scientifically sound it is, but rather by how many clicks it can generate.
While the intention of the content creator may not be to intentionally mislead people, they may doing so by not fully understanding the problem or future problems while developing their solution.