This is essential.
There are a whole lot of million of people that personal Bitcoin, however there are solely 53 million wallets.
Hyperlink to website displaying variety of wallets: https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html
On condition that exchanges and whales every have dozens/a whole lot of wallets, it is probably that solely 25 million distinctive individuals have Bitcoin wallets.
Not your keys, not your cash
When holding your cash on exchanges, you assume large counterparty danger
Exchanges use the cash to lend/borrow as wanted, permitting rehyothecation (which is unhealthy for the worth of Bitcoin).
Take 10 minutes to get a free comfortable pockets (Exodus, Coinomi, and so on.) or laborious pockets (Trezor, Ledger, and so on) and MOVE YOUR BITCOINS OFF EXCHANGES.