Chess.com classifies it as a mistake...
I think he purposely put the mistake button because he thinks f3 is a mistake. As I have said twice already, f3 is an opening move. You can’t classify e4 as the best move, if you get what I mean
Google and other search engines say it is not.
wdym?
f3 is not a mistake, it’s an opening move
Well everything says it's a mistake.