[vaseem]

Source code is stolen to explore vulnerabilities and develop zero day exploits.

More in this podcast https://darknetdiaries.com/episode/19/

[phpisthebest]

That old classic chestnut of lies by Closed Source companies intent on making CIOs believe Open Source is not secure...

[michaelmior]

Arguably vulnerabilities would be more likely to be found and disclosed if the code was open source.

[saagarjha]

That’s not typically how these exploits are developed.

[pionar]

Not typically, but that is how the LastPass breach occurred.