Your suspicion is legit — sometimes it really is hard to distinguish whether someone is a bot or not, especially when the writing is very polished. But we also shouldn't jump to conclusions — there are non-native speakers who are genuinely great at writing in English.

Macoy31

BooksAndArticles

Shill me some books! Looking for great biographies/memoirs

Signal312

Was @Macoy31 (outlawed) a bot? 

I was a little suspicious (the text seemed a little off, a little too flowery and well written for someone who was not a native speaker). 

But probably not suspicious enough. How to know for (almost) sure?
