Ethereum co-founder Vitaly Buterin planned to work as an intern at Ripple Labs in 2013, but due to difficulties in obtaining a US visa, he refused this idea.

Buterin commented on the post of Coinbase founder Brian Armstrong, who retweeted Bloomberg's article about Chinese billionaire Eric Yuan, who was denied a visa to the United States eight times.

“Fun fact: I tried to be an intern at Ripple back in the day (mid 2013), but US visa complications having to do with the fact that the company had only existed for 9 months and the minimum was 1 year stopped me,” wrote Buterin.

OpenCoin, which later became famous under the Ripple, was established by Chris Larsen and Jed McCaleb in September 2012.

In the tread to Armstrong's tweet, Justin Sun, TRON co-founder, who worked at Ripple Labs from December 2013 to 2016, supposed that he could become a friend to Buterin. Sun's LinkedIn profile reads that he was the first employee from China.

“When I found out these facts from @justmoon in late 2013/early 2014, had we both been at Ripple, I am certain we would have been buddies👬since we would have been the only 2 millennials there!,” Justin Sun wrote.

However, currently Buterin and Sun are far from friendship. In December 2018, Justin Sun wrote that the growth of ETH in 2017 was caused solely by HYIP. Buterin responded saying that those who put a dollar sign in front of a cryptocurrency ticker in their tweets is “basically a self-identified shill and not worth listening to.” Buterin also recalled the fact that TRON's white paper has dozens of sections copied from other p2p projects like the IPFS and Filecoin.