Btxchange.io reports that In 2017, a total amount of $1.25 billion was raised by 90 different ICOs. Sometimes it takes only a few hours to raise millions through ICOs. That would never happen with IPO, because It takes a lot of time to go through all the necessary regulatory procedures. One big downside of ICO is that successful and promising startups sell their tokens very fast. That means that interested investors must act as quickly as possible.