I was very confused for a while because I had no idea what a PC driving SIM card was.

Probably either auto-correct or one of the server-side rules of HN that upcased it

For readability I'm always lowering unnecessary uppercase characters when submitting posts and HN has never enforced changes.

I saw the same, that EdBot seems to meddle on post but not edit. IIRC, bot was persistent about some things like repeating characters.

Notepad++ sped up lowercasing for me.

The fact that you have to copy&paste into a different app, apply a feature of that app, then copy&paste again is absolutely ridiculous. It's just another example of how bots are stupid, and the dependency of their use is just lame.

In the context for the targeted audience it's clear sim is a simulator not a SIM card. Gamers know and talk about driving sims, they don't talk about SIM cards as much.