In particular, reviewing open source code has been repeatedly proven to be way harder of a task, than the proponents of this strategy are painting it to be. If you want an auditable codebase, you pretty much have to throw Linux, Chromium/Firefox, Gnome/KDE all out the window - there's just way too much code.
Auditable code is naturally always preferable to non-auditable, but you need to choose your trade-offs - or at least stop pretending you can read a hundred million lines in your life time.
On top of that - do you know a single non-tech person who knows how to set up a VPS, or knows what Veracrypt is? OTOH I can just show my wife: click here to enable backups.
Let me reframe the problem: What is your threat model? How much effort are you willing to commit to mitigate the dangers?