I share the scepticism about the ability of startups to disrupt away the network effects that underlie these quasi-monopolies, but it does seem to me as though

I share the scepticism about the ability of startups to disrupt away the network effects that underlie these quasi-monopolies, but it does seem to me as though decentralisation is the logical and desirable end-point. How and when that point could be reached though, I couldn't say.