For non-techie users, there is nothing else we can do but to trust the developers. Since we lack the knowledge to verify the safetiness of the wallet used, it does not matter whetheri it is a close source or open source, we only rely on the reputation of the said wallet.
Reputation is not enough. I cannot store my asset in a wallet because the company announced that the wallet is an open source or because the company is a major player in the crypto space. Their words and reputation are not enough. If they will not reveal the source code of the wallet on GitHub for other developers to verify it, then I have no business with such wallet.
Open wallet is not a guarantee ticket to security, because even the open source was created by someone and there person can update the server at anytime.
For a wallet that's open source, for every new update or version that's been released, the code is also updated on GitHub so there's nothing to hide.
But from what we discussed yesterday about this Atomic Wallet. It was an open source but funds were transferred from the main server and definitely need all know that, that is not an open source project again. Or was the software compromised? What happened does not look like an open source
Atomic wallet is a close source wallet.