Earlier quoted context omitted.
> Getting that sort of money is quite hard You could start a trust with ~1M in assets and if you avg 8% growth a year (taking into account management fees) you'd have 1B in 90 years just through compounding.
And you're defining "have a million dollars that you don't need to spend for 90 years" as not hard to achieve? Doable for some, even easy for some, but for the vast majority of people.... very hard.
I'm assuming this plan kicks off at death, so your trust wouldn't need to spend much to maintain itself.