The comment about there being no difference if you historically complied with the rules is not strictly correct. I have treated most of my contracts as being within IR35 but paid a high portion directly into my pension scheme reducing the Ers NI. Under the new rules I cannot do this and will loose out.
In a few years time they will make another foray into this market.
In the mid 1980s I joined KPMG's small business unit which was always seen as a feeder unit for growing businesses.
I did the same and found the recipients accounts were with the High Street Banks. When approached they showed zero interest.
I have also found that these fraudsters use Linkedin as a major source of information. I have worked at two companies where, within a week of updating my new role on Linkedin, I have received a CEO scam email.