Maybe tech companies know that they profit from redistribution, perhaps moreso than other companies? Tech products tend to be relatively expensive, but production is generally unlimited, because a significant proportion of the price reflects the fixed costs of development, which means that a larger market usually comes with profits. This is somewhat unlike e.g. agriculture or construction, where production quantities are more difficult to increase.
The primary reason I support it, and I don't think I'm alone among founders in this, is that I think that society is not going to work very well in the long term unless we strengthen our social safety nets. I want to live in a society that functions well, because I'm happier when surrounded by happier people.
I also think that it would enable more people to take the risk of trying something new if they knew that failing didn't mean destitution, and I think that we'd see significant upside from that in terms of economic competitiveness. I think I should be paying more taxes than I am to fund that, especially on unearned income.
There's an important distinction, however, between redistribution that seeks to create a more free and just society and retribution that seeks to prevent a society without consumers.
Most tech people in favor of redistributive schemes like UBI are in favor of the later.
Ah, well, I'm in favor of UBI and both of the reasons you mention for it - the free market is still the best way we've found to allocate resources to worthwhile projects.
