Another common tell nowadays is the apostrophe type (’ vs ').

I don't know personally how to even type ’ on my keyboard. According to find in chrome, they are both considered the same character, which is interesting.

I suspect some word processors default to one or the other, but it's becoming all too common in places like Reddit and emails.

Word (you know, the most popular word processor out there) will do that substitution. And on macOS & iOS, it's baked into the standard text input widgets so it'll do that basically everywhere that is a rich text editor.