More for some, less for others, by His knowledge.
Why provision differs between people
Ibn Kathir says Allah made people and their provision different, some rich and some poor, and He knows best what suits each of them. He alone decides this, so there is no reason to turn to anyone else for what only He gives.
Your friend posts the new car. Your cousin's wedding costs more than your year's salary. You check your own account and feel small. The comparison starts to feel like a judgement. The amount is a measure Allah fitted to you, not a grade on your worth.
If I have less, I must be worth less, or forgotten.
My share was measured by One who knows me. It is not a verdict on my worth.
Mute one account that makes you envious today. Thank Allah for three things you already have.