There aren't many great fortunes, they usually require dominating an industry (say, come to be one of top 5 vendors out of industry that initially had 10,000 competitors), and I think it's pretty unrealistic to believe you could dominate an industry without getting your hands dirty. There may be exceptions like Warren Buffet, but I think the dark path is much more common.
This is simply untrue. The number of great fortunes itself has vastly increased in tech's positive-sum economy. The increase in the number of multi-millionaires, and the growth of that class, has been deeply impacted by tech. And it's not just founders. Lots of execs and senior software engineers now possess fortunes that past ages would have considered great, even in real vs nominal dollars.
Not all industries are winner take all. And many industries remain to be invented by founders.
This fortune == crime is part of a scarcity mindset, and it's a shame that limits people.
They may eventually face competition, and then sure, you have to compete.
To say every great fortune stems from a great crime is self-limiting at best, at worst the germ of socialism.