[obstacle1]

> But I don't understand why people get so invested in it being a scam or failure.

Can't speak for everyone. But from my perspective, it's because certain "applications" are being marketed very heavily to non-technical people who aren't able to reasonably assess the viability of the technology. I'm thinking of NFTs in particular. The only other popularized non-NFT applications are cryptocurrencies, which are pure speculation (i.e., gambling).

In short, that's a moral issue. People were outraged by the Madoff scandal (and others), and this doesn't look a lot different to people who understand the underlying technology. Nobody wants their mom going broke because they bought some hyped-up blockchain thing on the advice of some super-hustler internet marketing influencer out looking to make a buck.