DeFi is already changing things a lot and these swap-machines (like uniswap, sushiswap, etc.), liquidity pools and yield farming has now taken over the game in their hands while most people are able to gain unbelievable rewards for trading there.
I haven't spent a huge amount of time looking in to DeFi (so perhaps I shouldn't really comment at all), but from what I have seen, it seems to me to be exactly as you claim - unbelievable rewards and gains. Until someone can prove to me otherwise, as far as I am concerned it is essentially going to be the same as the ICO craze. A minority of lucky people will make very good returns, a lot of people will lose everything or almost everything they put in, and in a year or two 99% of the projects/coins/tokens will be dead and forgotten.
What? Really? Since when? I used it some time back and it never asked me for KYC then, didn't know IDEX started KYC'ing users.
For over a year:
https://medium.com/idex/idex-kyc-transition-period-and-updated-asset-availability-for-us-markets-set-to-begin-d45e945f842dThe transition period will end on August 23, 2019, at which time trading and withdrawals through IDEX will only be available for those who have created an account and completed Tier 1 or Tier 2 verification.
Tier 1 is a $5k daily limit, and requires name, date of birth, and country of residence. Tier 2 is unlimited and additionally requires address, photo ID, and a selfie.