It's great to go to Youtube and find someone showing you how to fix the problem even for a relatively niche dishwasher. But if the ad money dries up for that content producer, that video won't be there the next time you look for it.
Not everyone who makes YouTube videos is doing it for ad money, especially the sort of content you're referring to. A lot of people just do it to document things for themselves and use YT as a "convenient place to put videos"; the fact that everyone else can see is incidental.