Because the hardware is being made obsolete for a reason. They are inefficient compared to modern hardware, consume way too much power and there are cheaper and more powerful options available.
A modern ARM-based computer like the Raspberry Pi 5 can outperform most computers and laptops running Windows 10 and have a smaller environmental footprint.
The problem is that the obsolete hardware is not cost effective to decommission and recycle. They have not been designed for an environmentally conscious world.