It's such a small amount that they're basically abandoned because it would cost more to transfer the BTC out of those addresses than the actual amount they hold.
@natemaddrey@coinmetrics@coinbase@Poloniex@binance@Grayscale It's tempting to compare BTC distribution to world or US wealth distribution, but as we've seen, the data can be pretty skewed because addresses <-> individuals are not a 1:1 mapping.
- in the beginning, miners received 50 BTC per mined block
- block reward halved every 4 years until max supply of 21 million BTC
- miners sell some of their BTC to cover costs, which helps distribute
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