I'm not going to try to unravel what the meaning is... but it's clear that a lot of people supported her in what she has stood for and done. The world is not only about poverty, disasters, environment, etc but also about transparency and the right to know. In a way this is quite a tangible demonstration of support.
Chelsea E. Manning is a network security and artificial intelligence expert, and activist. She is a former military intelligence analyst and political prisoner.
Chelsea was incarcerated at Alexandria Detention Center for nearly a year, due to her principled refusal to testify before a federal grand jury investigating the publishers of her 2010 disclosures. She was also fined $1,000 for each day she refused to testify, and those fines now total approximately $256,000.
On March 12, 2020, Judge Anthony Trenga ordered Chelsea Manning's release after the apparent conclusion of the grand jury, but he further ordered that she pay $256,000 in fines that had accumulated over the course of her confinement.