Just wait till he gets a well paid job, and his accountant suggests a good way of reducing his tax bill!
I doubt I’ll ever have a job that isn’t PAYE, so problem solved!
I’m not against things like pensions or ISAs or such. More the industrial-scale tax avoidance that requires expertise beyond what a regular person can do with a bit of reading or advice from the bank or building society.
When you have lawyers and accountants setting up companies for you and moving your money overseas and creating a web of financial transactions to hide huge sums of tax that would under normal circumstances be due, then I have a problem.