You can search for anon’s at https://www.google.com/search?q=anon73021533+site:https://forum.sketchfab.com/
You can browse anon’s activity at https://forum.sketchfab.com/u/anon73021533/activity
Truebones puts up his Autodesk / Mixamo collection on Sketchfab
Jan 2017 - Truebones puts up 2,000+ models on Sketchfab and puts a Paypal link in every one of them…
Truebones puts 2000+ models up on Sketchfab. Then puts a link to Paypal .
Jan 2017 - Truebones harasses others who use Mixamo - asking affected customers to buy the motions from Truebones -
Truebones claiming ownership of 'Truebones' Mixamo animations and harassing others using Mixamo .
Get shut down by bart the moderator.
Later, someone brought a 3d model, and Truebones didn’t reply, and asked to remove all paypal links. 
Truebones was later banned as multiple DMCA notices were issued to all his Truebones Autodesk Collection.