CAUCE mainly focuses on abusive messaging, but our board has a wide and diverse background in anti-abuse efforts.
Recently we came across this presentation on abusive robocalls dealing with an increase in Robocalling, trends in abusive calls, who is calling and who is being targeted. This study took place in 2019 and lasted most of the year. 

Sathvik Prasad, Elijah Bouma-Sims, Athishay Kiran Mylappan, and Bradley Reaves, North Carolina State University