If law enforcement in Texas brings charges then Steemit Inc can't flee and extradition of Justin Sun to the US is possible from most countries.
But it is not just US law that has been broken and the victims are around the world.
Even China has laws against theft.
Unless China actively protects him: see Ross Ulbricht.
Thanks for your insight here. Ross of the banned Silk Road website, apparently still in jail.
Extradition sounds good - in this case.