Indium is one of the least abundant elements.

In the entire Solar System it is less abundant than gold.

In the crust of the Earth, it is less depleted than most other metals with high electronegativity (like silver and gold), so the result is that here indium has about the same abundance as silver.

Indium is completely irreplaceable in LEDs and in high-speed power transistors. The future demand for these two applications alone is severely constrained by the existing indium reserves (e.g. replacing all light bulbs and laptop/phone chargers and computer PSUs, in the entire world, with more efficient modern types would need a lot of indium).

Because of that, extreme efforts are needed to find substitutes for indium in its other applications, like for the computer displays, all of which currently use transparent electrodes made of doped indium oxide.

It is very undesirable to find new applications that would consume more of the scarce indium.