HMRC themselves (RCDTS) used IT workers who were being paid via "Disguised Remuneration" Schemes in the period 2010-2016. They then stopped using the schemes.
Q. How much Tax/NIC should have been paid by those #LoanCharge Scheme Providers ?
Q. Was it ever paid ?
Q. Who paid it ?

See also my letter to Mel Stride asking for the answers to these and a number of other pertinent questions concerning the double standard adopted by the Treasury, HMRC and its agencies/subsidiaries.