Too Long; Didn't Read
On 2017–03–06 and the day following that, a significant number (57) of tor relays joined the network, they all share the nickname prefix “UbuntuCore”.<br>In March 2017 over 290 such relays joined the tor network. This sparked my interest.<br><strong>TLDR: As a tor user, you do not need to worry about them (yet)</strong>, because they only make up a tiny part of the tor network (current total consensus weight fraction: <0.05%).