Could you elaborate? It's been 15 years since the bitcoin paper and I still don't see where the game changing commercial applications of crypto are beyond the black/grey market uses for which it has already been adopted.
For example, Filecoin lets you store data for $2.33 per TB per year. If you used S3 that would be $150. The Golem network let's you run compute jobs for $0.003 per CPU core per hour.
The only barrier here is software. There just aren't enough developers to build anything useful. There could be a user-friendly web service like the AWS console that enables normal developers to use this stuff, but nobody has built one yet. Golem could support GPU compute so that people can use it to train AI models cheaply, but they are short on devs so that feature is still in the backlog.
Give it time. Encrypted email has been possible since at least the 90s, but many hospitals still haven't adopted it and are using fax machines. Before people can adopt crypto, they first need to understand it, and that's not going to happen for a long time.
While Amazon might cost more, they're unlikely to go out of business tomorrow or in ten years. They also have an SLA and predictable prices and predictable capacity. if you build something on AWS that works today it'll likely work tomorrow.
The pure IP routing networks of 20 years ago were not full capable of making VoIP work well enough for general usage.
It might not work at all, but it's not necessarily a Ponzi scheme (which isn't even really an accurate way to describe NFTs, which are a mostly worthless asset bubble; ponzi schemes require lying about transactions having taken place, not lying about the future value of an asset)