Best 2FA Password Protection?

My dad just got all his info hacked... I've been meaning to help him with his password & Identity Protection, but don't feel all that qualified myself. He's also suspicious of big tech holding all the keys to his data which makes things that much more difficult. Is there an app for IOS that makes a safe keychain, that isn't held by google/microsoft/apple etc?

He's been cautious with big data companies for a long time, and It's not exactly changing …

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