sayeth Wikipedia:
> On 13 September 2019, District Judge Vanessa Baraitser ruled that Assange would not be released on 22 September when his prison term ended, because he was a flight risk and his lawyer had not applied for bail. She said when his sentence came to an end, his status would change from a serving prisoner to a person facing extradition.
So he’s on remand: https://en.m.wikipedia.org/wiki/Remand_(detention)
> Because imprisonment without trial is contrary to the presumption of innocence, pretrial detention in liberal democracies is usually subject to safeguards and restrictions. Typically, a suspect will be remanded only if it is likely that he or she could commit a serious crime, interfere with the investigation, or fail to come to the trial.
Because he’s a proven flight risk.