Hello everyone, we can heard in this forum that bitcoin is not centralized and it is one of advantages, but what do you think about this article and the idea that bitcoin is not centralized? I am saying this based on below research which is done on ETH Switzerland and Germany.
https://www.ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/system-security-group-dam/research/publications/pub2014/spmagazine_gervais.pdf