I dont think Wrobot itself is delectable. I see bots from time to time and its somewhat obvious how they act. Plus im pretty sure they know the accounts that bot and just wait for enough to show up and ban then regardless if they are on or not. They're not going to catch you right away and ban you, because you'll not exactly why and adjust. The account you're on right now could be flagged and you dont even know it.
And i'm pretty sure the GM or the person who designs the bot detection software has Wrobot so they know what to look for.