Chainanalysis just posted a thorough report on crypto crimes in 2019. From dark web to scams to hacking, they summarize the numbers for all of it.
https://go.chainalysis.com/rs/503-FAP-074/images/2020-Crypto-Crime-Report.pdf
Scams were by far the highest category. The report covers money...
Anyone just starting out in crypto should read through this Reddit list and comments.
https://www.reddit.com/r/CryptoCurrency/comments/7r6chx/here_is_a_list_of_crypto_ponzi_schemes_and_people/?st=JCL2Q8UN&sh=212a66a4