Of course you need to use their own wallet. An ICO's coin has it's own wallet just as bitcoin, ethereum, litecoin, and other cryptocurrencies has their own separate wallets;
And Bitcoin and Litecoin are accepted by many other wallets. And many wallets except multiple coins.
Can someone tell me why in many cases ICO's expect you to use their wallet? I already have five wallets and if I diversify enough, I wll most assuredly get lost. David
Hi David, it's because ICOs are unproven. It costs developer time and money for an exchange to set up the infrastructure to accept, trade, and exchange a new coin. Many of the ICOs fail. It would be an extreme waste of resources for exchanges or wallets to openly accept new ICOs without them having demonstrated a loyal following of users. To get around this, ICO teams need to provide their own wallet. If the ICO succeeds, eventually other wallets and exchanges will begin to accept the new coin.