Despite numerous daily dust or sometimes a few thousand sats dumped to the legacy address of the Genesis block, today some entity transfered a whopping 2.6236284BTC as "donation" to address 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa, or whatever the intention was for such an amount.
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You're right that the BTC could have been a great help if sent to a charity organization, but people have the right to do whatever they like with their coins, and I believe if it isn't worth the person won't have sent the BTC to the genesis wallet.
The reason could be that s/he is thanking Satoshi for creating BTC footing the benefit the person has gotten through BTC or wanted to get notice just like the person that million worth of ETH to died wallet address just to pass an information across the world.
One thing is sure. We can only guess the intention of the person that sent the Bitcoin until s/he confirm