I'd say fake money.
For uber, we've never had the overpriced cabs that it was made to circumvent in the first place. It was more of a wild west with lots of smaller companies with in-house made sites. We've even had an app that checked their prices, ordered the cheapest ones and cancelled others once a car is found. Then a major player entered the market, and they didn't know what the fuck they were doing, giving estimates but driving by the meter, which ended up consistently much higher in the end. Then uber came, and started undercutting everyone with stupidly low prices, but their app/maps are an unbearable garbage. So they did a merger with previous one, combining the idea with decent app, and continued until competition crumpled. And now they're screwing both drivers and customers hard, but there's now no alternative.
The only good thing that came out of it is incentive structure and a punishment for drivers for not taking orders. It made it so that as a customer you can safely order without fear that you'd have to wait for hours to find a car - your hot potato order can't be passed off forever, and somebody has to pick it up eventually, even if it's a bad driver who majorly fucked up recently and now has to take it for redemption, or otherwise lose his job.
Airbnb never made financial sense to me. Because every time I looked there, I found the same, and much better options, for as much as half price on local ad boards. Seems to be just a convinience factor, as renters just put their properties at 2x there for an off-chance a rich tourist checks in.
AI to me seems like a dead end. The innovations are cool and flashy, but they inevitably fall short of being reliable enough to be useful. Like, I don't use chatgpt anyhow because there's always a chance it'll spit out plausible bullshit which makes it so that every answer must be double-checked. And if you can find the source to check against, then why even ask the bot in the first place? Same for art, it can get you maybe halfway there, but refining the prompt takes skill and time that'd be better spend learning to edit and make real art instead.
But for cryptocurrencies I should've bought in way sooner. Even if they didn't hit ATH's every few years. I find that even drug dealers and crooks are more trustworthy than my own government, who is actively malicious, and has hurt my financial wellbeing harder and more often than even the crypto rug pulls. And that's coming from someone who got hit by luna, ftx, and even mtgox, among others. Still better than the government straight up saying that you don't own any of your money anymore. Yes, the ecological impact sucks, but it's not a crypto problem specifically. I don't see how mining is worse than, than, say, a literal mining operation across the road that uses electrical heating because they're too poor to fix their windows and put proper insulation, and running heaters just makes financial sense? There must be regulations to make dirty power more expensive, which will make the problem solve itself. And if we have green energy, who cares what one's using it for? Mine, game, hang christmas lights, whatever, who gives a shit