"I don't think it was extremely hard to get Justin to swallow anything that was in a weak position and make him believe that those STEEM could be used any way he wanted."

"Accredited investor
An accredited or sophisticated investor is an investor with a special status under financial regulation laws. The definition of an accredited investor, and the consequences of being classified as such, vary between countries. Generally, accredited investors include high-net-worth individuals, banks, financial institutions and other large corporations, who have access to complex and higher-risk investments such as venture capital, hedge funds and angel investments. Laws may require that some types of financial offerings may only be made to accredited investors."
https://en.wikipedia.org/wiki/Accredited_investor

When you're buying private corporations, it's safe to assume you're an accredited investor. Anything Justin Sun didn't know about Steemit, including any obligations it had undertaken regarding it's Steem hodlings, is entirely Justin Sun's responsibility.