Uniswap owes its success to the thousands of community members that have joined its journey over the past two years. These early community members will naturally serve as responsible stewards of Uniswap.
49 million UNI are claimable by historical liquidity providers. The formula accounts for LP liquidity on a per-second basis since the deployment of Uniswap v1, ensuring that rewards are weighted towards LPs that provided liquidity when total liquidity was low.
Thousands of Uniswap early adopters are waking up to an early Christmas present this morning
400 Uni are available to claim by each and every address (Including the 12,000~ Addresses that only ever submitted a failed transaction) that has ever interacted with the Uniswap v1 or v2 protocols.

As of writing thats nearly 3 ETH worth of Uni tokens given out to all the users, based on a snapshot ending September 1, 2020 at 12:00 am UTC. With Liquidity Providers (LPs) get even more Uni!
1 lucky LP (Liquidity Provider) woke up to a massive airdrop (128,801 Uni, Which is now worth around $400,000 USD at time of writing) since he was an early LP for the v1 protocol