Private Key Deprecation Recap
Disabling the use of private keys, mnemonics, and keystores on the MyCrypto.com was not an easy decision, but it was a decision that made sense for us, for you, and for the ecosystem as a whole. Thus, you can no longer enter a private key, mnemonic phrase, or keystore file on MyCrypto.com.
The main reason for this change is due to the inherent insecurity of entering secrets into the browser. With our full release of MyCrypto Desktop, you can continue to use your private keys, mnemonics, and keystore files safely and securely on your desktop!
You can read more about our decisions here: A Safer MyCrypto.