Question Reusable small and nano launch vehicles - a good investment?

Nov 3, 2021
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Looking at the small and nano launch market and wondering whether the market leaders are already clear or whether there is an opportunity for a Space-X at the smaller end of the launch market. Not rideshare, but for those who want dedicated launch.

This recent report seems to suggest so, and there are a few companies in the sector.

But what are the main challenges for nano/small payload launch companies to produce a reusable rocket and why has nobody done it yet?

Also are bio-fuels going to become a thing, or does nobody care? I understand the soot is a problem, more than the carbon footprint itself.