I don't think it has anything to do with lack of faith in the US Dollar, which seems to be doing just fine. It very likely has a lot to do with interest rates

I don't think it has anything to do with lack of faith in the US Dollar, which seems to be doing just fine. It very likely has a lot to do with interest rates being very low, and the stock market being very high. Returns on capital in typical investments are very low, and that pushes capital to other investments, including VC. Couple that with a very hot technology sector that's producing incredible amounts of value, and it's very clear why capital is chasing tech startups of all sizes.