About 20+ days ago ,I sent a transaction with 5000sats fee.

20+ !

It hasn’t been confirmed yet!

Ok to pay more ,confirmed faster.

But isn’t it ok for pay less confirm slower?

The miners are too centralized,and a lot of dust trans was made every day.

From A to A with high fee rate! Why does this transaction exist?

I don’t think a normal man would make such a nonsense transaction.