Normally, I only look at the charts so this is somewhat over my head. I need some time to digest all this. But how is it possible to offer 2000% APY? Suppose I plunk down $1 Million. After 12 months, my bounty would swell to $21 Million (that's a 21 bagger, dude!!

). Is this realistically possible? Or maybe something's got lost in translation, I dunno.
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You do understand quite a bit

Nice catch on APY vs APR. Yes, fees (rewards aka yields for the yield farmers/AMM's/Liquidity Pool providers). The rewards have to be compounded, i.e. collected and re-deposited to increase the yield farm to achieve 2000% APY
Oops before anything else, if Pepe or Eth goes down 90%, your $1M invested into yield farming on this LP will lose 45% of its value. You are taking directional risk on both crypto assets pepe and eth
It's not sustainable for a whole year not even sure it's sustainable for a whole month, and it's all dependent on the trading volume, where the rewards are coming from, aka yields
So, let's create a scenario you can understand or relate to. You heard that Jump and Jane Street are leaving the US crypto market making operations, I did not read the article but if you research the details, you might discover that it only pertains for their US operations, they are still very active "offshore" with their lucrative crypto market making operations, through their international companies/branches/subsidiaries
They do their MM operations in cexes, i.e. Binance dot com, FTX dot com (lol) Coinbase dot com (no more, give up on this because of Operation Chokepoint 2.0)
Well, in dexes, someone like me provides the market making through a smart contract. Uniswap is a dex, a smart contract on the blockchain
Uniswap charges fees on the trades, Uniswap makes hundreds of millions of $ worth of crypto assets, sometimes exceeding the trading volume of Coinbase
But Uniswap does not have inventory of crypto assets for trading/swapping. Liquidity Pool's are the ones that provide the inventory, and Uniswap pays out most of the fees to the LP providers
The bigger the TVL total value locked in the liquidity pool, the more the fees are shared among the participants. The fact that I quit the LP when I saw Pepe was going up should have been a clue that 2000% APY is not enough return to make me stay
Since you already know the APR, let's say it's 1% interest per day, on a $40k LP pair Pepe-Eth, that's $400/day
But Pepe went up 50% in the last 24 hours, which means only the $20,000 in Pepe would have gone up and the LP would be worth $50k, but compare that to holding $40k of Pepe in a wallet, would have gone up by $20k to $60k
If the 2000% APY was sufficient reward for the LP's, everyone would join the Liquidity Pool and drive the yields down for the yield farmers
Other LP pairs on Uniswap are yielding much less
I didn't take a picture of when I was bout to quit the yield farm, but from memory it was around $700, fees are in crypto assets Pepe and Eth, and Pepe went up so the rewards values go up, but when I talk about $, there is really no $ involved, we denominate everything in dexes in crypto assets, the money we value in our cryptos ecosystem
Picture below is after a few hours, you can see the rewards accrued and can be claimed and put back in the yield farm
Pepe trading volume past 24 hours is over $1B so lots of trading fees generated by cexes and dexes (left side of the picture)