None, and I mean none. We haven't seen all the revolutionary blah blah blah, it was all a guise for cashing out. They really played people, took their money and are living their life comfortably now.
What about the existence of the blockchain? it's also can be considered as a technology that is developed in the crypto too. I may think if you did not create an incorrect point about that dude. There was a lot of dapps and DeFi. You can also see the swap service.