In my experience, it depends on the person.

I drink a cup of coffee or less before noon with breakfast or brunch. No super-caffeinated energy drinks! I avoid coffee after around 2PM or I’ll have trouble sleeping at night.

I'm not sure why the AI response is saying that but no. Technically it can't. You can overdo it but there's no direct link that says it can cause seizures.

Caffeine can trigger seizures. It won't happen right away. It can can take up to 3 days to trigger the seizures. But on the other hand some people can drink caffinated drinks with no side effects.

Doesn't bother me. I drink up to 3 cups per day.

I use PROTEIN milk (prefer chocolate flavor, yet many flavors available) in my coffee plus add MCT C8 Oil (coconut oil with no flavor) to allow me to enjoy 3 cups of coffee a day.