Assange is a flawed personality. That said, over the years there was a transformation. People defended him despite his issues when his whistleblower endeavors aligned. Once they no longer aligned, many many of his supporters turned around and called out his peccadilloes and transgressions.
People still defend Snowden but if he ever releases information seen as politically damaging to one side, all that adulation is out the window.
That’s to say all this support isn’t actually principled support but rather political.