That is a big part of it.
It's one reason why Linus Torvalds was so much of an a$$hole when it came to building Linux. Dude didn't want people to screw it up with weaknesses because they didn't know what they were doing. It's not completely safe, but has a lot fewer vulnerabilities to exploit.
There are countermeasures to this stuff (open source does additionally mean more people can take a look at the issues), but the attacker always has the advantage.
Yeah and imo the Cybersecurity industry will probably see a Golden Age because of it.
If I were in that field and all these attacks start ringing off, I'd start testing the market.
If there's a tangible thing in most of software, a solid consistent, it's security. It doesn't have a shiny ceiling, but it's the main true floor raiser.
You can have the coolest app and tech in the world, but if your security is shyt, then it won't matter.
Dave's banking with this breach has basically given up their biggest asset - their trust. Now their stock is nosediving because of it.