This is essential.
There are a whole bunch of million of people that personal Bitcoin, however there are solely 53 million wallets.
Hyperlink to web site displaying variety of wallets: https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html
On condition that exchanges and whales every have dozens/a whole bunch of wallets, it is seemingly that solely 25 million distinctive individuals have Bitcoin wallets.
Not your keys, not your cash
When holding your cash on exchanges, you assume huge counterparty threat
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 gentle pockets (Exodus, Coinomi, and so forth.) or exhausting pockets (Trezor, Ledger, and so forth) and MOVE YOUR BITCOINS OFF EXCHANGES.