Re Child benefit, any income above £50,000 will reduce the child benefit, up to £60,000 where it is totally lost. This can be offset by making pension contributions, however, I doubt any bot is intelligent enough for that, where is the glamour in that.
To be honest, I doubt whether half of them actually know how to properly declare their income.
Can you imagine if HMRC launched an Audit on an MLM, and requested income statements for each consultant. The MLM would be completely in the clear as the liability to disclose income is on the arms length consultant.
Backdating tax, back dating NI, back dating High Income child benefit charge, impacts on benefit entitlement...
This would cripple 99% of them, as I doubt they do not set aside cash for such emergencies.