* DDG is atrocious for anything other than English * Programing/IT searches often yield garbage on DDG while on Google a good result is within the first 3.
I have it as my default now too, but "!g" is a constant companion.
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Regarding Google and Amazon being unstoppable... it seemed the same once for Microsoft.
Once they get too big/powerful (which they arguably already are), they could be broken up or severely hamstrung by legislation.
They can also start to stagnate and be out-done by new competition based on new technologies.
All of those seem unlikely right now, but 10 years can change a lot.
Of course both Google and Amazon both enjoy large network effects and are pretty capital intensive. Which is typical for mono/oligopolies.