Uniswap just put up their tokens yesterday ($UNI) and there are a few youtubers who have reported about users are eligible to receive up to $1500 in tokens from them if they have used their platform ending on September 9th. Can you verify this and if it is a scam or not?

I can't tell if the original UNISWAP airdrop is legit or not, since I didn't take part it in. But please beware, there are already a few UNISWAP airdrop scams around
Uniswap airdrop is legit, few of my friends claimed the tokens and sold them via Binance. Everyone that used Uniswap until September 1st is eligible for 400 UNI tokens. Some people claimed thousands of UNI tokens as you were eligible for each wallet you use, so for example if you connected 10 wallets to Uniswap until the deadline, you got 4000 UNI. At the moment 1 UNI=6 USD , so it's not a surprise that there are scam attempts using this occasion. That's what scammers do, they quickly adapt and always try to exploit latest craze/hype.