Well, I have used forums a long time (since 56K modems were typical at home), and I have noticed since then that forums get absolutely much more inundated with the same "dumb" questions that could be easily found with a quick search than what they used to (as it's always been a problem, but it does seem worse now). I wouldn't doubt if their was an uptick the amount of time the same 5 questions gets asked per week (even adjusted for higher member counts/inflation).
One thing I read about last year was that Gen Z in particular, as well as some younger millennials (or younger than me anyway), are never taught how to do a search for information or use a search engine. The reason they aren't taught is that since they grew up with tech and Internet natively, that they already know it. The result is that as adults, they do poorly in jobs that require completing your work on a computer, because nobody trained them how to use a particular software (under the presumption they would just know how to do it). Can't seem to find the article now.
I think that might be part of the issue as well (in addition to not understanding how forums aren't the same as chat rooms or Reddit). In trying to find the above article, I also saw links where people asked on Quora and Reddit "do people just not know what Google is anymore" and the like—which btw, if you think the forum has gotten repetitive with easy and dumb questions, never look at Quora unless you want to lose as much faith in human "intelligence" as I have. There's also an article with a title about how Gen Z runs to TikTok to search for info rather than Google because they prefer visual information. I didn't read the article though, it's not important.
That's a particular problem in itself. I skimmed the article and there's a line about "Google gave rise to institutions, TikTok to individuals". Problem is, most individuals are dumb, give wrong information with authority and confidence they're right, and perpetuate garbage. People seem to be way more trusting of a random stranger with no evidence or qualifications than someone with an actual education and evidence. That's nothing new either though (and also doesn't mean that just because someone is an authority on something, that they should be inherently trusted). Anyway, that whole visual thing doesn't explain asking the same redundant questions 100 times a day that could be easily found with a basic search.
Personally, I graduated high school in 2005. I remember in middle school having typing class and computer class on computers with Win 95. And being taught in high school how to use search engines—they brought a cart around with those black IBM laptops with the red rubber cursor button from classroom to classroom and it was a whole class period thing. Do they not do that anymore?