they are very lively at first but the high APY also means high risk. I think when DeFi got popular high APY we've seen a lot and they just end up disappearing without a word. It's a scary thing, I think the average ends up like that, but if they can be sustainable they're great.
The risk is too high. High apy means so many tokens will be generated in hourly even minutes basis. So, this will give impact to the price of token. You can take so many high APY tokens in the market about how it was growing down so fast after people are starting to get what they have been staking with non sense apy like that. Im sure that if anyone also aware about that too. SAFUU has become a scam token.
High APY doesn't always means there are a lot of tokens generated, it also means that you could have very low amount of investors. So even if you are changing like just 1000 dollars worth of investment but there is only a single person, then all that 1000 will go to one person, whereas if there are 1000 of them, then each will get one dollar.
This is just an example which is why I believe that we should be making sure that it is not just high APY that is due to high return which will make it high inflation, it should be high APY due to being new and lacking enough investors. That would be a much better situation to be in and give you a better return for a short period of time.