And yet all your local retailers are closing down while Amazon gets bigger every year. It applies basically everywhere. while you're correct that its easy to get started on Amazon, it's just as easy to get marginalized there. There a tons of reports from sellers which got ruined by Amazon undercutting them after they've pioneered the market for example.

The internet enables centralization like never before as everyone all over the world uses the same services just like they're following the same people for entertainment.