Accumulating that much after doesn't involve being "smart", just being a boomer.
However much it is, it isn't their money and is owned by someone else. This is fundamentally theft and people aren't recompensed by the banks for the risk they take having them manage their money. Interest rates for savers are already criminally low, at a time of sky-high inflation, so whether people realize it or not the power-that-be are already dipping their hand into their bank account.
This just upgrades to them using a wheelbarrow so they can carry more at once.