Board Thread:Questions and Answers/@comment-38.88.210.82-20150819181059/@comment-1820055-20150820001726

supposedly, they can determine if it's a catbomb or an F5, though the question lies, if they activaly check it or not. The server can log HTTP requests and what happened to the request-response, including headers and whatnot. Most catbomb involve non-200 HTTP status codes, and can be logged on their server. Deliberate refresh will not generate your non-200 HTTP statuses.

Do note that refreshing a few times via catbomb or simple mistake is different from **abusing** the function.

In any case, F5 is only dangerous if you do it mid-game, especially mid-sortie repeatedly. Some may argue that they have been doing this ever since, but some report that they do get banned, so in the end it's your choice to really refresh mid-sortie.

Even refreshing in rapid succession before game start is safer, because at that point, no API call was made and there's no way to associate the refreshing to your account.