Oh, of course it is trivial, the issue is the political will to do it. As for tax havens I was thinking more along the lines of corporate tax evasion by companies like Apple.

Minimum tax that they can never go below. Start penalizing tax havens like Ireland.

There are already inheritance taxes but they should have caps on them since they hit intergenerational wealth and social mobility for lower and middle classes far more than the upper.

All technology becomes degraded over time. Enshittification is real.