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Not a scam but maybe over engineered and difficult to sell for most uses? Theoretically blockchain could be used for all sorts of applications, but apart from a bunch of startups it's not taken off. Maybe it's just not compelling financially for businesses.
For an established business or organisation It'd be a big leap to switch over to blockchain but the benefits are not immediately relisable or tangible in a business setting. In a world where short term profits already trump long term investment, it does make sense that business are not rushing to adopt blockchain.
I'd think of it like this - companies don't have the foresight to invest in IT and security; they slash IT budgets, use equipment until the last possible moment deferring expensive upgrades and don't put money in to protect themselves from cyber crime. For example, big banks quite literally still use systems that are decades out of date.
If companies behave like that already why would they invest in switching to the block chain? The benefits are long term and not easily understood. It's hard to sell investment in a technology on blockchain when most people struggle to understand what it is, let alone what it's benefits may be.
Most people only know about it because of cryptocurrency but even then don't really understand how it works, and that usage scenario is world's away from the other theoretical uses. Cryptocurrency makes money because it's a speculative asset (at the moment at least). Other uses at best prevent fraud and companies are generally useless at trying to prevent fraud. When they do, it's focused around the actual transactions not the ledger. They don't see someone "cooking the books" being the priority problem to solve.
Data security and verifying is not a priority for companies. If companies are spending money at the moment, it's short term nonsense such as the AI bubble. And public organisations seldom have the imagination or freedom/resource to be an early adoptor a new technology.
So, no I don't think it's a scam. I think it's something that is difficult to implement and sell in the real world. And all people can see at present is "crypto currency goes up in value" not the actual underlying benefit of cryptocurency as a currency. Crytpcurrency is doing well currently because it is scarce and has become an asset bubble, not because the blockchain itself is the star.