He was trying to get hold of someone to tell them about his mistake. He has been unsuccessful so far. Besides that, someone who is in some way connected to one of the Telegram groups accepting donations advised him that he can create his own campaign and accept donations! Who knows which of those activities are genuine and which ones are for filling some scammer pockets.
This is the first time I hear about this incident ... whatever it was, it seemed to me for some reason that this was not an advertising tab, and that https://blockchair.com should check the published data. The only thing I would probably care about if I wanted to donate to Assange's support is that I would use a mixer, (in my country the secret services are not very friendly towards this kind of donation, simply adding such non-profit foundations to the register of undesirable organizations). 