As someone with similar feelings in general and a similar history, I feel you are blaming only the latest and worse effects on tech and of tech on society.
I started my career in parallel with mobile devices and smartphones. The whole idea of new possibilities, new ways to interact with tech, miniaturization, etc., is what called me most as it was a huge field starting and I tried to find my path forward. I've seen from close, real close, how an incredible tech, full of possibilities has been slowly been captured by the market capitalists that inevitably always ended up controlling the direction of every company.
This is not caused by crypto, this is not caused by LLMs. The origin is greed and capitalism. Decisions being made to make number go up.
Really, crypto is a fascinating tech, it's not the fault of the technology that crypto-bros came to conquer everything and misuse it and abused it to make a quick buck.
LLMs are impressive, think about it, we have managed to completely break the Turing test. We have machines that sound so human that mostly everyone is in a constant suspicion that everything they see is made by an LLM. LLMs sound so human that they are full of confidence and mostly always full of shit. Just think about it, AI is just a representation of humanity, what we do with it just represents and highlights the issues in society.
The reality is that those two, have just suffered a faster, the fastest we've seen yet probably, tech lifecycle - growth, hype, plateauing, and eventually decline and enshittification of any service related to the tech.
Consider search engines, their demise is not because of AI, AI is just the last blow. I used to be very good at finding what I wanted, I knew how to use the tool to make the best of it. Slowly over the years much as I want, I cannot get the results I want without a lot of effort. I haven't somehow become shit at it, the tools and the tech have been modified and changed until it has become useless, the whole point is not finding anymore, but making you search as much as possible.
Consider the mobile hardware field as it is now, compared to the years when it started blowing up with all kind of devices and possibilities. The market has been captured, a few companies remain, releasing the same thing over and over with the latest and bigger number each year. Slowly the whole wild world we had of custom roms, has been captured so that if you get out of the fenced field your apps won't work because it is not safe. Apps check that you are using them in an unmodified and perfectly controlled OS where you own nothing. Apple has always been king of fenced fields, but now Google is doing all it can to imitate it, squeezing in and trying to capture as much of their open field into their very high fenced safe areas. They want to control the source of apps, the developers, and remove the freedom from the devices. It's crypto and LLMs at a slower pace. Working for so many years as a developer I can feel how I'm more and more tied up to the whims and wishes of companies that don't pay me the salary, I keep bringing this up and make a safer path for the future but the company that does pay my salary doesn't care, they just want the latest BS and hyped concepts.
People like you or me, we have a special vantage point. We know how we can still fight that, we know what are the alternatives, we know what the tech could become. We need to bring that knowledge to everyone, keep pushing for FOSS solutions, keep teaching everyone that tech is not difficult, it's not magic, but it requires learning and education. It requires not falling on the path of less resistance, and fight against lobbying and market capture. It's tough, when we just get so tired of constantly fighting it. What I think you find so tiring is not Crypto and LLMs but how tech is being guided to its demise, to become a tool for control and nothing more.