Don't be sad because I also didn't get 400 UNI tokens, and some of my other friends got 400 UNI tokens, and some of them also didn't have enough gas to sell the UNI tokens to uniswap, it was very pity too when they used to be actively trading at Uniswap but did not have enough gas when the UNI token was given.
This only means they didn't trade, rather dumped the coins and took out ETH into fiat.
No once can tell me they're an active trader but don't have $10 in ETH to pay for gas