You're looking purely at the market caps and revenues, while the economy is also a function of employment and political influence. Heavily regulated segments might have fewer players (at first), but those are regulated and their power is curtailed. And like another commenter said, unregulated markets (and historical examples are aplenty, especially in the US), quickly see consolidation and concentration of power in the hands of a few corporations (even if they happen to be nominal competitors), and little regulation means their power (which is not the same as their revenue or market cap) can grow unhindered.
In as much as SV companies "disrupt" old industries, they usually consolidate power. Uber may not be big yet, but it's bigger than any single taxi company, and it wants to be a lot bigger still. How Uber transfers risk to its workers and pretends its nothing but a "marketplace" has the potential to change work relations and job security. It's just that Amazon's business practices look more similar to the ones we know from the gilded age, while what Google and Uber do is new, but not any less exploitative.
Opting-in and choice has little relevance here. A modern democracy must ensure that no unelected entity (and even elected bodies have checks and balances) gains too much control over people's lives even if people seem to want it.
In as much as SV companies "disrupt" old industries, they usually consolidate power. Uber may not be big yet, but it's bigger than any single taxi company, and it wants to be a lot bigger still. How Uber transfers risk to its workers and pretends its nothing but a "marketplace" has the potential to change work relations and job security. It's just that Amazon's business practices look more similar to the ones we know from the gilded age, while what Google and Uber do is new, but not any less exploitative.
Opting-in and choice has little relevance here. A modern democracy must ensure that no unelected entity (and even elected bodies have checks and balances) gains too much control over people's lives even if people seem to want it.