![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](https://fry.gs/pictrs/image/c6832070-8625-4688-b9e5-5d519541e092.png)
That’s where the second and third paragraphs come in. Because other companies likely test it themselves, too.
They’ll typically report security bugs privately and then, after X amount of months, publicly announce the bug. Doing it this way will, ideally, force the other company to patch the bug prior to the announcement. If not, they’ll end up with a publicly known security bug that bad actors can now exploit. The announcement will also let the public (including companies) know to update their software.
I admittedly should’ve done more research before my first comment, but it does actually turn out that everything I said is true. Proton’s technology was previously audited by Mozilla and is currently audited by SEC Consult and other companies regularly, and the audits are available for everyone to view. Additionally, they do have a bug bounty program. Also (and this is something I didn’t mention), the ProtonVPN and Proton Mail apps are all open source.