You're right, digging in a bit most of these "every day" millionaire likely have it all in illiquid assets, mainly their houses. But these people do have the option to downsize a little and not use their primary residences as their only long term savings accounts.

A related article from last year says there are around 5.5M people in the US with more than $1M in liquid, readily investable assets. I doubt many of them own, let alone self custody any bitcoin.

https://www.cnbc.com/2024/03/22/the-us-is-the-top-country-for-millionaires-and-billionaires.html

Easier said than done. Most people don't know anything about bitcoin, money, technology, or anything else they'd need to self custody without the help of a 3rd party. I'd much rather recommend paid services that help people use self-custody than leave them to figure it out on their own.

But by all means if you want to train your friends and family and co-workers how to use the available free options please do. We need more people doing that too, but it's a big responsibility.

Agreed. First to figure it out will do a much better job preserving any future purchasing power.