Do you know of many such companies started in the recent decade or two ? that achieved near monopoly state , without unfairly crushing competitors, without depending on network effects(which naturally favor one winner), and without unfairly using regulation ? or without so greatly benefiting from an initial advantage , to the point that even if they stopped seriously competing , no one could harm them ?

Probably not, maybe a few. Why ? because the economy has became a network economy, where almost all industries benefit greatly from network effects. And network effects are unfair by their nature: they give such a huge advantage to the to the leader , even if he doesn't constantly improve.

But why we see so much disruption you ask? well ,disruption also works on monopolies, by making it unprofitable for them to compete. And of course there are always new niches and people's preferences change so that hurt monopolies too.