I remember reading this article and being concerned that state actors had simply flooded the tor nodes to allow them to them to perform attacks to deanonymize a user. It’s possible that Arstechnica just has some agenda against Tor because it seemed like for awhile they were putting out articles like this every few months on the Tor network and people being arrested who used Tor.
https://arstechnica.com/information-technology/2013/08/tor-u...