Once they have a key, they can obtain and spend cryptocurrency. Without the key, the holder can’t spend or convert their cryptocurrency — rendering their holdings worthless unless and until the key is recovered.
Each major cryptocurrency has its own Wikipedia page providing an introduction to the cryptocurrency. Monitoring Wikipedia views has been seen to be a good way to track the number of new users learning about a cryptocurrency [22], and may offer different insights to the other online factors considered, being focussed primarily on less knowledgeable users.

Binance.US does not provide information on an internal wallet offering, but you can keep your coins within your account on the exchange. It also partners with Trust Wallet, a third-party hot wallet option. You can withdraw your coins from your account onto your own hot or cold storage option at any time (for a fee).
Another institutional hit for bitcoin–which probably had the most sustained effect–was the SEC’s refusal to approve a bitcoin exchange-traded fund (ETF). This would be a path for more mainstream people in finance to dabble with blockchain; it would allow investors to dip their toes in bitcoin without owning the actual asset. Not only that, but it would make bitcoin available on the most prominent financial markets. The U.S. Securities and Exchange Commission (SEC), however, has yet to allow such a fund to exist–mostly because it is unable to monitor crypto-transactions in order to avoid market manipulation.