There are mathematical numbers that are very Very VERY small. Even though those numbers are not mathematically zero, they can be considered to be zero in the real world.
For example...
You sit in a large room full of air at 23 degrees celsius. The air is a typical earth atmosphere (a bit more than 14 pounds per square inch) with approximately 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, etc.
[...]
There is a non zero possibility that you could be
struck by lightning once a year while sitting on a toilet taking a crap every year for 17 consecutive years. I think any reasonable person would also say that there is ZERO CHANCE of that actually happening as well.
Oh, wow, thanks for the examples. I see, so I always had this fear somebody could randomly generate my private key one day and take my funds, even if I'd be using hardware wallets. Now you clarified that and I get it. Thanks!
It's a sketchy scam.
Well, I wanted to use it just once and even the setup part looked pretty sketchy to me. I had that feeling something's wrong with it. (wanted to use it for educational purposes, no stealing intention)
Looks like I have so much to learn that my questions are actually kinda stupid..