Yeah, BOINC is a good example. The one I prefer to remember fondly is SETI@home. I used to let my laptop run that in the hopes that I'd get an email from NASA telling me I discovered aliens. The thing with BOINC is people think they are saving lives. The thing with SETI is people think they are finding aliens. The think don't with people mining thing is, they are just stupid animals scam for falling a.
There are some really good BOINC projects that actually do something good (like WCG, help researches to study cancer, C19, gut microbiome and etc) and then there are some rather silly ones or purely academic ones (like PrimeGrid, you just count primes, that's all). And you can do BOINC projects and mine at the same time. Then you go to the other side and realize that there are some mining projects that do things differently, try new things, innovate and might lead to some new tech, some others are just fascinated with cryptocoins. The thing that people really dislike about crypto, isn't even the tech by itself, they dislike speculators "influencers" (aka pumpers) and lots of other scummy financial crud, but let's be honest, every financial instrument has those and that's especially more expected to happen if they aren't regulated yet. And while those same unpleasant people caused one GPU shortage (in 2018), it wasn't exactly as obvious in 2020-2021. In fact, there were multiple problems working together: 1) GPU markets had shortage at first due to C19 pandemic 2) Many OEMs like Zotac, Giga, eVGA scalped hard themselves 3) Used car buyers jacked up prices 3) nV and AMD raised prices to survive C19 shortages, but not by a lot, only by 20-40% 4) Worldwide inflation rose a lot 5) Many semiconductor factories had to shut down due to C19 6) Supply chain still was weak after recovery and many raw material prices were temporarily or not so temporarily up 7) Major launches of consoles 8) Retailers themselves scalped hard due to shortages or even mined themselves 9) There was and still is a massive shortage of older node or trailing edge transistors and transistors needed for machines that make transistors 10) nVidia and AMD launched AI and Ml GPUs, a market that has insane growth and they both prioritize them due to superior margins. So actually nV and AMD were better prepared than before to avoid 2018 meltdown, but so many other things lead to shortages and insane prices. So I find blaming miners for everything to be a bit silly and not really fair, they are just convenient scapegoat to imperfectly explain why there was shortage and crazy prices in 2020-2021 and why prices are still high.
Whether mining is a scam or not, I think it depends on your expectations. If you know what it is and what to expect, then it's not a scam. However if platform lies about crypto and promises crazy stability and profitability, then it's definitely a scam and needs SEC trial. If you only come from "influencers" (aka pumpers) and you see a dump, it's an obvious scam. The thing is that many people fall for all of that nonsense, some know things well, but love gambling and speculating bit too much and minority is fascinated by tech or concept and cares about it mostly for learning potential or innovation potential. If your GPU that you bought can mine or do something besides gaming or GPGPU work, I believe you should be able to use it for that stuff. nVidia already gimped mainstream cards from FP64 performance and full quality drivers, that mostly hurted small hobbyists, BOINC like projects and other similar users, actual businesses just bought Quadros due to support. So we lost something and now those small people are basically forced to buy overpriced Quadros. I think that's bad and I don't really want the same to happen with mining, because the only solution that nV or AMD has is gimping their otherwise fully featured product and then later releasing way overpriced fully unlocked product with same hardware. So it just ends up hurting us in some way, meanwhile hardcore miners will mod their card drivers if there's money to be made. The only question is what will be hurt this time besides miners? Maybe hobbyist password hackers, maybe someone else or maybe some less known features in games. I don't trust nV or AMD to do a proper job, therefore they should just give up and stop.