I would say technology is where all the big money can be made. If you invest in tech startups or crypto you can get a really high ROI but its very risky.
Not just tech startups. Investing in startups does have their own risk and there is no such thing as zero-risk investment. While some startups may become successful within a short period of time it does not necessarily mean that every startup will be so. There are many ICOs whose companies are not doing well and are trying to cope up with different partnerships. So it all comes down to a bit of risk management - if you see profits take then and exit. Plain and simple investment method.
From my perspective, Bitcoin was like a startup in its yearly days (while some would say it still is) but so many startups go bust and bite the dust within a year or so, so amount of risk is extreme in the field.
I would not call bitcoin as a startup because its not so. Its based on some ideology and a method to disrupt the current economy and banking system. Its more like a radical technology. Though some may argue that, that makes it an unique startup.