Indesign 18.3 crashes on startup

So, that's what happens.
I know you are aware of it, but searching for maybe an answer, I see posts going back for years, with the same problem. I see CS6 posts! There might be something fundamentally wrong with the app, no?

I've reset preferences, and everything else I found searching the topic, nothing helps.
Anyway, uninstalling and switching to 18.1 let's me work. And that's what I am paying a lot of money for. This should not happen with a pro program like Indesign.