If you want, you can quickly and easily identify the user of bitcoin. First of all, you will be given an increased interest in the topic of bitcoin, communication on forums and social networks.
And how would you link a forum account to a bitcoin holder? There are ways to mask your IP and people rarely register email accounts with their real names and addresses.
Even if you get the real name or IP of the forum user there's no certainty that he will be a Bitcoin holder.