Donate your lowest cost basis stock and write off at current market value. Donate stock directly to avoid taxes incurred by selling. Lowest cost basis because that removes the largest unrealized capital gains from your personal portfolio. Maybe do so over some number of days to cost average if you are donating oodles like Buffet.

Even for much much smaller amounts, donations (of various kinds) of appreciated assets can use tax law to considerable advantage.

The expensive insurance thing is a hard thing to prove, it’s definitely an opinion rather than a fact. What I saw was the huge success Geico had with their advertising programs, and then every other insurance company deciding to run expensive ad campaigns. The costs of that marketing is paid for directly by the consumer, we’re paying to watch all these dumb characters and cavemen try to sell us car and home insurance, when it used to be a quiet thing you did at the bank.

Elisabeth did not have a product or well functioning company and if she decided to sell (even if she could) large portion of her shares this would likely cause investors to panic

You may think one majority shareholder (including yourself) is better and/or will optimize cash flows closer to what you desire than another. But otherwise it's still the cash flows that ultimately determine the value.

Once Starlink gets going many expect it to rake in the cash but Musk has said quite explicitly that they're going to spend it on going to Mars. It wouldn't be hard to structure that spending either as expenses or charity. So again, no profit to be taxed on.

This is of course why he's keeping SpaceX private. Investors have to understand that SpaceX's future profits are going to Mars, not back to the investors.

edit: this isn't completely true. They do plan on spinning off Starlink, so if they do it should be profitable and pay taxes. Musk may shuffle his Starlink profits into a Mars expdition, but Starlink itself will pay taxes and other owners will end up paying capital gains taxes etc.