How can Uniswap accept this thing?
Uniwap is not the same as CEX and it was not doing any verification or audit and the listing process is almost similar with the another dex. It's not so difficult to do that.
How could the price beat bitcoin in a matter of days?
As some member stated above if it caused by FOMO or yield farming. These crap finance platforms were offering non sense yield farming for the stakers. I know some that were offering more than 10k APY.
The next one that will look like bitconnect?
those projects already similar to the bitconnect and becareful with those defi. Some defi has been putting the backdoor to make the contract deployer will be able to take all of liquidity pool. I call this the evolution of Ponzi project. Stay away from this.