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How do you define Open-Source on you article? Because all I've read was just wallets that were just transparent and secured
(some were not).
Open-source, in technological terms, is being defined as:
denoting software for which the original source code is made freely available and may be redistributed and modified.
In which simply means that their application codes / source code must be free to download, access, and change for either an update, a bug fix, or an enhancement. Meanwhile, indicating that those wallets are open source without indicating it's github or code link is just a pure fraud and a clickbait.
If ever a wallet would be open-source, it can be used by other people to duplicate that wallet and pretend to be an original for their thefts and attacks. It would be ridiculous to have nor trust an open-sourced wallet as you would be vulnerable in many aspects, including your holdings to be exact.