It helps only yourself.
If you are a miner or big LN routing node is totally another story. But for a regular meaningless user, it doesn't matter.

DarthCoin

So you don't agree that running a mempool helps the network as a whole?

Scoresby

bitcoin_beginners

Why Should I Have a Bitcoin Core Full Node If I'm Not a Miner?

0xbitcoiner

Just for few of your onchain txs is not relevant to have a full blown core node 24/7.

If you transact only onchain you can easily just start that core app every day, few minutes and let it sync. Then close it down. Nothing burger. It's all fine.

KEEPING A CORE NODE 24/7 OPEN IT DOESN'T MEAN YOU HELP THE NETWORK. You help only yourself.
Even if you use another client connected to that core node, like Sparrow, you need it only TO SERVE THE LATEST BLOCKS and sync your wallet. That's all.

On contrary, if you do not know how to secure well your network and keep a core 24/7 you are mostly receive more attacks than usual and will slow down your whole network, FOR NOTHING.