You can see all listed coin/tokens on UNISWAP on here.
https://coinmarketcap.com/exchanges/uniswap/from CMC, we can see there are ~40 coin/tokens listed on there (5 of them don't have any volume anyway). I don't think it's scam or not, but rather about pump and dump coin/token on UNISWAP
if you see from the link that you share, in my opinion it is natural. If there is a pump / dump of tokens listed on Uniswap, I think that's how the market works. many crypto or token markets, and they are all pretty much the same.